Game 1 Unit 11 of 64 1 hr learning time

Collectibles

Add data cores that the player can collect.

17% of Neon Nexus

Mark as complete Completed!

What You’re Building

Data cores. Collect them to win.

Collectibles

Green diamonds scattered around the arena. Touch them and they disappear.

Item Data

Each item has a position and an active flag:

NUM_ITEMS = 4

item_x:       .res NUM_ITEMS
item_y:       .res NUM_ITEMS
item_active:  .res NUM_ITEMS   ; Non-zero if item exists

Collection Detection

Same distance check as enemy collision, but the result is different:

check_item_collisions:
    ldx #0
@check_item:
    lda item_active, x
    beq @next_item      ; Skip if already collected

    ; Distance check (same as enemy collision)
    ; ...

    ; Collected!
    lda #0
    sta item_active, x   ; Deactivate item
    inc items_collected

@next_item:
    inx
    cpx #NUM_ITEMS
    bne @check_item
    rts

Item Sprites

Items use sprite palette 2 (green) to distinguish them from enemies (red):

update_item_sprites:
    ldx #0
    ldy #20             ; OAM offset

@loop:
    lda item_active, x
    beq @hide_item

    lda item_y, x
    sta oam_buffer, y
    iny
    lda #SPRITE_ITEM
    sta oam_buffer, y
    iny
    lda #%00000010      ; Palette 2 (green)
    sta oam_buffer, y
    ; ...

The Code

; =============================================================================
; NEON NEXUS - Unit 11: Collectibles
; =============================================================================
; Add data cores that the player can collect.
; =============================================================================

PPUCTRL   = $2000
PPUMASK   = $2001
PPUSTATUS = $2002
OAMADDR   = $2003
PPUSCROLL = $2005
PPUADDR   = $2006
PPUDATA   = $2007
OAMDMA    = $4014
JOYPAD1   = $4016

BTN_UP     = %00001000
BTN_DOWN   = %00000100
BTN_LEFT   = %00000010
BTN_RIGHT  = %00000001

PLAYER_START_X  = 124
PLAYER_START_Y  = 116
PLAYER_SPEED    = 2
ENEMY_SPEED     = 1
NUM_ENEMIES     = 4
NUM_ITEMS       = 4
STARTING_LIVES  = 3
COLLISION_DIST  = 6
COLLECT_DIST    = 8
INVULN_TIME     = 90

TILE_BORDER    = 1
TILE_FLOOR     = 2
TILE_CORNER_TL = 3
TILE_CORNER_TR = 4
TILE_CORNER_BL = 5
TILE_CORNER_BR = 6
SPRITE_PLAYER  = 7
SPRITE_ENEMY   = 8
SPRITE_LIFE    = 9
SPRITE_ITEM    = 10

ARENA_LEFT   = 16
ARENA_RIGHT  = 232
ARENA_TOP    = 24
ARENA_BOTTOM = 208

DIR_RIGHT = 1
DIR_LEFT  = $FF
DIR_DOWN  = 1
DIR_UP    = $FF
BG_COLOUR = $0F

.segment "ZEROPAGE"
player_x:       .res 1
player_y:       .res 1
buttons:        .res 1
temp:           .res 1
row_counter:    .res 1
frame_count:    .res 1
lives:          .res 1
invuln_timer:   .res 1
game_over:      .res 1
items_collected: .res 1

enemy_x:        .res NUM_ENEMIES
enemy_y:        .res NUM_ENEMIES
enemy_dir_x:    .res NUM_ENEMIES
enemy_dir_y:    .res NUM_ENEMIES

item_x:         .res NUM_ITEMS
item_y:         .res NUM_ITEMS
item_active:    .res NUM_ITEMS   ; Non-zero if item exists

.segment "OAM"
oam_buffer:     .res 256

.segment "BSS"

.segment "HEADER"
    .byte "NES", $1A, 2, 1, $01, $00, 0,0,0,0,0,0,0,0

.segment "CODE"

reset:
    sei
    cld
    ldx #$40
    stx $4017
    ldx #$FF
    txs
    inx
    stx PPUCTRL
    stx PPUMASK
    stx $4010

@vblank1:
    bit PPUSTATUS
    bpl @vblank1

    lda #0
@clear_ram:
    sta $0000, x
    sta $0100, x
    sta $0200, x
    sta $0300, x
    sta $0400, x
    sta $0500, x
    sta $0600, x
    sta $0700, x
    inx
    bne @clear_ram

@vblank2:
    bit PPUSTATUS
    bpl @vblank2

    jsr load_palette
    jsr draw_arena
    jsr set_attributes
    jsr init_game

    lda #$FF
    ldx #0
@hide_all:
    sta oam_buffer, x
    inx
    bne @hide_all

    jsr update_all_sprites

    lda #0
    sta PPUSCROLL
    sta PPUSCROLL

    lda #%10000000
    sta PPUCTRL
    lda #%00011110
    sta PPUMASK

main_loop:
    lda game_over
    bne @game_over_loop
    jsr read_controller
    jsr move_player
    jsr move_enemies
    jsr check_enemy_collisions
    jsr check_item_collisions
    jsr update_all_sprites
    jmp main_loop

@game_over_loop:
    jmp @game_over_loop

init_game:
    lda #STARTING_LIVES
    sta lives
    lda #0
    sta game_over
    sta invuln_timer
    sta items_collected

    lda #PLAYER_START_X
    sta player_x
    lda #PLAYER_START_Y
    sta player_y

    jsr init_enemies
    jsr init_items
    rts

init_enemies:
    lda #48
    sta enemy_x+0
    sta enemy_y+0
    lda #DIR_RIGHT
    sta enemy_dir_x+0
    lda #DIR_DOWN
    sta enemy_dir_y+0

    lda #200
    sta enemy_x+1
    lda #48
    sta enemy_y+1
    lda #DIR_LEFT
    sta enemy_dir_x+1
    lda #DIR_DOWN
    sta enemy_dir_y+1

    lda #48
    sta enemy_x+2
    lda #176
    sta enemy_y+2
    lda #DIR_RIGHT
    sta enemy_dir_x+2
    lda #DIR_UP
    sta enemy_dir_y+2

    lda #200
    sta enemy_x+3
    lda #176
    sta enemy_y+3
    lda #DIR_LEFT
    sta enemy_dir_x+3
    lda #DIR_UP
    sta enemy_dir_y+3
    rts

init_items:
    ; Place 4 items around the arena
    lda #80
    sta item_x+0
    lda #64
    sta item_y+0
    lda #1
    sta item_active+0

    lda #168
    sta item_x+1
    lda #64
    sta item_y+1
    lda #1
    sta item_active+1

    lda #80
    sta item_x+2
    lda #160
    sta item_y+2
    lda #1
    sta item_active+2

    lda #168
    sta item_x+3
    lda #160
    sta item_y+3
    lda #1
    sta item_active+3
    rts

check_enemy_collisions:
    lda invuln_timer
    beq @check
    dec invuln_timer
    rts

@check:
    ldx #0
@check_enemy:
    lda player_x
    sec
    sbc enemy_x, x
    bpl @check_x_pos
    eor #$FF
    clc
    adc #1
@check_x_pos:
    cmp #COLLISION_DIST
    bcs @next_enemy

    lda player_y
    sec
    sbc enemy_y, x
    bpl @check_y_pos
    eor #$FF
    clc
    adc #1
@check_y_pos:
    cmp #COLLISION_DIST
    bcs @next_enemy

    jsr player_hit
    rts

@next_enemy:
    inx
    cpx #NUM_ENEMIES
    bne @check_enemy
    rts

check_item_collisions:
    ldx #0
@check_item:
    lda item_active, x
    beq @next_item

    lda player_x
    sec
    sbc item_x, x
    bpl @item_x_pos
    eor #$FF
    clc
    adc #1
@item_x_pos:
    cmp #COLLECT_DIST
    bcs @next_item

    lda player_y
    sec
    sbc item_y, x
    bpl @item_y_pos
    eor #$FF
    clc
    adc #1
@item_y_pos:
    cmp #COLLECT_DIST
    bcs @next_item

    ; Collected!
    lda #0
    sta item_active, x
    inc items_collected

@next_item:
    inx
    cpx #NUM_ITEMS
    bne @check_item
    rts

player_hit:
    dec lives
    lda lives
    beq @game_over

    lda #PLAYER_START_X
    sta player_x
    lda #PLAYER_START_Y
    sta player_y

    lda #INVULN_TIME
    sta invuln_timer
    rts

@game_over:
    lda #1
    sta game_over
    rts

update_all_sprites:
    jsr update_player_sprite
    jsr update_enemy_sprites
    jsr update_item_sprites
    jsr update_lives_display
    rts

update_player_sprite:
    lda game_over
    beq @alive
    lda #$FF
    sta oam_buffer+0
    rts

@alive:
    lda invuln_timer
    beq @show
    and #%00000100
    beq @show
    lda #$FF
    sta oam_buffer+0
    rts

@show:
    lda player_y
    sta oam_buffer+0
    lda #SPRITE_PLAYER
    sta oam_buffer+1
    lda #0
    sta oam_buffer+2
    lda player_x
    sta oam_buffer+3
    rts

update_enemy_sprites:
    ldx #0
    ldy #4
@loop:
    lda enemy_y, x
    sta oam_buffer, y
    iny
    lda #SPRITE_ENEMY
    sta oam_buffer, y
    iny
    lda #%00000001
    sta oam_buffer, y
    iny
    lda enemy_x, x
    sta oam_buffer, y
    iny
    inx
    cpx #NUM_ENEMIES
    bne @loop
    rts

update_item_sprites:
    ldx #0
    ldy #20             ; OAM offset after enemies
@loop:
    lda item_active, x
    beq @hide_item

    lda item_y, x
    sta oam_buffer, y
    iny
    lda #SPRITE_ITEM
    sta oam_buffer, y
    iny
    lda #%00000010      ; Palette 2 (green)
    sta oam_buffer, y
    iny
    lda item_x, x
    sta oam_buffer, y
    iny
    jmp @next_item

@hide_item:
    lda #$FF
    sta oam_buffer, y
    iny
    iny
    iny
    iny

@next_item:
    inx
    cpx #NUM_ITEMS
    bne @loop
    rts

update_lives_display:
    ldy #36             ; OAM offset for lives
    ldx lives
    beq @hide_all

    lda #8
    sta oam_buffer, y
    iny
    lda #SPRITE_LIFE
    sta oam_buffer, y
    iny
    lda #0
    sta oam_buffer, y
    iny
    lda #16
    sta oam_buffer, y
    iny

    cpx #1
    beq @hide_rest

    lda #8
    sta oam_buffer, y
    iny
    lda #SPRITE_LIFE
    sta oam_buffer, y
    iny
    lda #0
    sta oam_buffer, y
    iny
    lda #26
    sta oam_buffer, y
    iny

    cpx #2
    beq @hide_rest

    lda #8
    sta oam_buffer, y
    iny
    lda #SPRITE_LIFE
    sta oam_buffer, y
    iny
    lda #0
    sta oam_buffer, y
    iny
    lda #36
    sta oam_buffer, y
    rts

@hide_rest:
@hide_all:
    rts

move_enemies:
    ldx #0
@enemy_loop:
    lda enemy_x, x
    clc
    adc enemy_dir_x, x
    sta enemy_x, x
    cmp #ARENA_LEFT
    bcs @check_right
    lda #DIR_RIGHT
    sta enemy_dir_x, x
    lda #ARENA_LEFT
    sta enemy_x, x
    jmp @move_y
@check_right:
    cmp #ARENA_RIGHT
    bcc @move_y
    lda #DIR_LEFT
    sta enemy_dir_x, x
    lda #ARENA_RIGHT
    sec
    sbc #1
    sta enemy_x, x
@move_y:
    lda enemy_y, x
    clc
    adc enemy_dir_y, x
    sta enemy_y, x
    cmp #ARENA_TOP
    bcs @check_bottom
    lda #DIR_DOWN
    sta enemy_dir_y, x
    lda #ARENA_TOP
    sta enemy_y, x
    jmp @next_enemy
@check_bottom:
    cmp #ARENA_BOTTOM
    bcc @next_enemy
    lda #DIR_UP
    sta enemy_dir_y, x
    lda #ARENA_BOTTOM
    sec
    sbc #1
    sta enemy_y, x
@next_enemy:
    inx
    cpx #NUM_ENEMIES
    bne @enemy_loop
    rts

load_palette:
    bit PPUSTATUS
    lda #$3F
    sta PPUADDR
    lda #$00
    sta PPUADDR
    ldx #0
@loop:
    lda palette_data, x
    sta PPUDATA
    inx
    cpx #32
    bne @loop
    rts

draw_arena:
    bit PPUSTATUS
    lda #$20
    sta PPUADDR
    lda #$00
    sta PPUADDR
    lda #0
    sta row_counter
@draw_row:
    lda row_counter
    cmp #0
    beq @top_row
    cmp #1
    beq @top_row
    cmp #28
    beq @bottom_row
    cmp #29
    beq @bottom_row
    jmp @middle_row
@top_row:
    lda row_counter
    cmp #0
    bne @top_row_inner
    lda #TILE_CORNER_TL
    sta PPUDATA
    lda #TILE_BORDER
    ldx #30
@top_fill:
    sta PPUDATA
    dex
    bne @top_fill
    lda #TILE_CORNER_TR
    sta PPUDATA
    jmp @next_row
@top_row_inner:
    lda #TILE_BORDER
    ldx #32
@top_inner_fill:
    sta PPUDATA
    dex
    bne @top_inner_fill
    jmp @next_row
@bottom_row:
    lda row_counter
    cmp #29
    bne @bottom_row_inner
    lda #TILE_CORNER_BL
    sta PPUDATA
    lda #TILE_BORDER
    ldx #30
@bottom_fill:
    sta PPUDATA
    dex
    bne @bottom_fill
    lda #TILE_CORNER_BR
    sta PPUDATA
    jmp @next_row
@bottom_row_inner:
    lda #TILE_BORDER
    ldx #32
@bottom_inner_fill:
    sta PPUDATA
    dex
    bne @bottom_inner_fill
    jmp @next_row
@middle_row:
    lda #TILE_BORDER
    sta PPUDATA
    sta PPUDATA
    lda #TILE_FLOOR
    ldx #28
@floor_fill:
    sta PPUDATA
    dex
    bne @floor_fill
    lda #TILE_BORDER
    sta PPUDATA
    sta PPUDATA
@next_row:
    inc row_counter
    lda row_counter
    cmp #30
    beq @done_drawing
    jmp @draw_row
@done_drawing:
    rts

set_attributes:
    bit PPUSTATUS
    lda #$23
    sta PPUADDR
    lda #$C0
    sta PPUADDR
    ldx #8
    lda #$00
@attr_top:
    sta PPUDATA
    dex
    bne @attr_top
    ldx #6
@attr_floor:
    lda #$00
    sta PPUDATA
    lda #%01010101
    sta PPUDATA
    sta PPUDATA
    sta PPUDATA
    sta PPUDATA
    sta PPUDATA
    sta PPUDATA
    lda #$00
    sta PPUDATA
    dex
    bne @attr_floor
    ldx #8
    lda #$00
@attr_bottom:
    sta PPUDATA
    dex
    bne @attr_bottom
    rts

read_controller:
    lda #1
    sta JOYPAD1
    lda #0
    sta JOYPAD1
    ldx #8
@read_loop:
    lda JOYPAD1
    lsr a
    rol buttons
    dex
    bne @read_loop
    rts

move_player:
    lda buttons
    and #BTN_UP
    beq @check_down
    lda player_y
    sec
    sbc #PLAYER_SPEED
    cmp #ARENA_TOP
    bcc @check_down
    sta player_y
@check_down:
    lda buttons
    and #BTN_DOWN
    beq @check_left
    lda player_y
    clc
    adc #PLAYER_SPEED
    cmp #ARENA_BOTTOM
    bcs @check_left
    sta player_y
@check_left:
    lda buttons
    and #BTN_LEFT
    beq @check_right
    lda player_x
    sec
    sbc #PLAYER_SPEED
    cmp #ARENA_LEFT
    bcc @check_right
    sta player_x
@check_right:
    lda buttons
    and #BTN_RIGHT
    beq @done
    lda player_x
    clc
    adc #PLAYER_SPEED
    cmp #ARENA_RIGHT
    bcs @done
    sta player_x
@done:
    rts

nmi:
    pha
    txa
    pha
    tya
    pha
    lda #0
    sta OAMADDR
    lda #>oam_buffer
    sta OAMDMA
    inc frame_count
    lda #0
    sta PPUSCROLL
    sta PPUSCROLL
    pla
    tay
    pla
    tax
    pla
    rti

irq:
    rti

palette_data:
    .byte BG_COLOUR, $11, $21, $31
    .byte BG_COLOUR, $13, $23, $33
    .byte BG_COLOUR, $19, $29, $39
    .byte BG_COLOUR, $16, $26, $36
    .byte BG_COLOUR, $30, $27, $17    ; Player
    .byte BG_COLOUR, $16, $26, $36    ; Enemies
    .byte BG_COLOUR, $1A, $2A, $3A    ; Items (green)
    .byte BG_COLOUR, $30, $27, $17

.segment "VECTORS"
    .word nmi
    .word reset
    .word irq

.segment "CHARS"
.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
.byte %11111111,%10000001,%10000001,%11111111,%11111111,%00010001,%00010001,%11111111
.byte %00000000,%01111110,%01111110,%00000000,%00000000,%11101110,%11101110,%00000000
.byte %00000000,%00000000,%00000000,%00000000,%00000000,%00000000,%00000000,%10000001
.byte %00000000,%00000000,%00000000,%00000000,%00000000,%00000000,%00000000,%00000000
.byte %11111111,%11000000,%10100000,%10010000,%10001000,%10000100,%10000010,%10000001
.byte %00000000,%00111111,%01011111,%01101111,%01110111,%01111011,%01111101,%01111110
.byte %11111111,%00000011,%00000101,%00001001,%00010001,%00100001,%01000001,%10000001
.byte %00000000,%11111100,%11111010,%11110110,%11101110,%11011110,%10111110,%01111110
.byte %10000001,%10000010,%10000100,%10001000,%10010000,%10100000,%11000000,%11111111
.byte %01111110,%01111101,%01111011,%01110111,%01101111,%01011111,%00111111,%00000000
.byte %10000001,%01000001,%00100001,%00010001,%00001001,%00000101,%00000011,%11111111
.byte %01111110,%10111110,%11011110,%11101110,%11110110,%11111010,%11111100,%00000000
.byte %00011000,%00011000,%00111100,%01111110,%11111111,%10111101,%00100100,%00100100
.byte %00000000,%00011000,%00011000,%00111100,%01000010,%01000010,%00011000,%00000000
.byte %00011000,%00111100,%01111110,%11111111,%11111111,%01111110,%00111100,%00011000
.byte %00000000,%00011000,%00100100,%01000010,%01000010,%00100100,%00011000,%00000000
.byte %00000000,%00100100,%01111110,%01111110,%00111100,%00011000,%00000000,%00000000
.byte %00000000,%00000000,%00000000,%00100100,%00011000,%00000000,%00000000,%00000000
; Tile 10: Item (data core - diamond)
.byte %00000000,%00011000,%00111100,%01111110,%01111110,%00111100,%00011000,%00000000
.byte %00000000,%00000000,%00011000,%00100100,%00100100,%00011000,%00000000,%00000000

.res 8192 - 176, $00

Build It

ca65 nexus.asm -o nexus.o
ld65 -C nes.cfg nexus.o -o nexus.nes

Collect the data cores. They vanish when touched.

Collection feels good, but there’s no score yet. Unit 12 adds scoring.

What Changed

Unit 10 → Unit 11

+159-228

1	1		`; =============================================================================`
2		-	`; NEON NEXUS - Unit 10: Lives and Death`
	2	+	`; NEON NEXUS - Unit 11: Collectibles`
3	3		`; =============================================================================`
4		-	`; Add lives system with death and respawn.`
	4	+	`; Add data cores that the player can collect.`
5	5		`; =============================================================================`
6	6
7		-	`; -----------------------------------------------------------------------------`
8		-	`; NES Hardware Addresses`
9		-	`; -----------------------------------------------------------------------------`
10	7		`PPUCTRL = $2000`
11	8		`PPUMASK = $2001`
12	9		`PPUSTATUS = $2002`
			...
15	12		`PPUADDR = $2006`
16	13		`PPUDATA = $2007`
17	14		`OAMDMA = $4014`
18		-
19	15		`JOYPAD1 = $4016`
20		-	`JOYPAD2 = $4017`
21	16
22		-	`; Controller buttons`
23		-	`BTN_A = %10000000`
24		-	`BTN_B = %01000000`
25		-	`BTN_SELECT = %00100000`
26		-	`BTN_START = %00010000`
27	17		`BTN_UP = %00001000`
28	18		`BTN_DOWN = %00000100`
29	19		`BTN_LEFT = %00000010`
30	20		`BTN_RIGHT = %00000001`
31	21
32		-	`; -----------------------------------------------------------------------------`
33		-	`; Game Constants`
34		-	`; -----------------------------------------------------------------------------`
35	22		`PLAYER_START_X = 124`
36	23		`PLAYER_START_Y = 116`
37	24		`PLAYER_SPEED = 2`
38	25		`ENEMY_SPEED = 1`
39		-
40	26		`NUM_ENEMIES = 4`
	27	+	`NUM_ITEMS = 4`
41	28		`STARTING_LIVES = 3`
42	29		`COLLISION_DIST = 6`
43		-	`INVULN_TIME = 90 ; 1.5 seconds of invulnerability`
	30	+	`COLLECT_DIST = 8`
	31	+	`INVULN_TIME = 90`
44	32
45		-	`; Tile indices`
46		-	`TILE_EMPTY = 0`
47	33		`TILE_BORDER = 1`
48	34		`TILE_FLOOR = 2`
49	35		`TILE_CORNER_TL = 3`
50	36		`TILE_CORNER_TR = 4`
51	37		`TILE_CORNER_BL = 5`
52	38		`TILE_CORNER_BR = 6`
53		-
54	39		`SPRITE_PLAYER = 7`
55	40		`SPRITE_ENEMY = 8`
56		-	`SPRITE_LIFE = 9 ; Life icon`
	41	+	`SPRITE_LIFE = 9`
	42	+	`SPRITE_ITEM = 10`
57	43
58		-	`; Arena boundaries`
59	44		`ARENA_LEFT = 16`
60	45		`ARENA_RIGHT = 232`
61		-	`ARENA_TOP = 24 ; Leave room for HUD`
	46	+	`ARENA_TOP = 24`
62	47		`ARENA_BOTTOM = 208`
63	48
64	49		`DIR_RIGHT = 1`
65	50		`DIR_LEFT = $FF`
66	51		`DIR_DOWN = 1`
67	52		`DIR_UP = $FF`
68		-
69	53		`BG_COLOUR = $0F`
70	54
71		-	`; -----------------------------------------------------------------------------`
72		-	`; Memory Layout`
73		-	`; -----------------------------------------------------------------------------`
74	55		`.segment "ZEROPAGE"`
75	56		`player_x: .res 1`
76	57		`player_y: .res 1`
			...
79	60		`row_counter: .res 1`
80	61		`frame_count: .res 1`
81	62		`lives: .res 1`
82		-	`invuln_timer: .res 1 ; Invulnerability countdown`
83		-	`game_over: .res 1 ; Non-zero when game is over`
	63	+	`invuln_timer: .res 1`
	64	+	`game_over: .res 1`
	65	+	`items_collected: .res 1`
84	66
85	67		`enemy_x: .res NUM_ENEMIES`
86	68		`enemy_y: .res NUM_ENEMIES`
87	69		`enemy_dir_x: .res NUM_ENEMIES`
88	70		`enemy_dir_y: .res NUM_ENEMIES`
	71	+
	72	+	`item_x: .res NUM_ITEMS`
	73	+	`item_y: .res NUM_ITEMS`
	74	+	`item_active: .res NUM_ITEMS ; Non-zero if item exists`
89	75
90	76		`.segment "OAM"`
91	77		`oam_buffer: .res 256`
92	78
93	79		`.segment "BSS"`
94	80
95		-	`; -----------------------------------------------------------------------------`
96		-	`; iNES Header`
97		-	`; -----------------------------------------------------------------------------`
98	81		`.segment "HEADER"`
99		-	`.byte "NES", $1A`
100		-	`.byte 2`
101		-	`.byte 1`
102		-	`.byte $01`
103		-	`.byte $00`
104		-	`.byte 0,0,0,0,0,0,0,0`
	82	+	`.byte "NES", $1A, 2, 1, $01, $00, 0,0,0,0,0,0,0,0`
105	83
106		-	`; -----------------------------------------------------------------------------`
107		-	`; Code`
108		-	`; -----------------------------------------------------------------------------`
109	84		`.segment "CODE"`
110	85
111	86		`reset:`
			...
146	121		`jsr set_attributes`
147	122		`jsr init_game`
148	123
149		-	`; Hide all sprites initially`
150	124		`lda #$FF`
151	125		`ldx #0`
152	126		`@hide_all:`
			...
159	133		`lda #0`
160	134		`sta PPUSCROLL`
161	135		`sta PPUSCROLL`
162		-	`sta frame_count`
163	136
164	137		`lda #%10000000`
165	138		`sta PPUCTRL`
			...
169	142		`main_loop:`
170	143		`lda game_over`
171	144		`bne @game_over_loop`
172		-
173	145		`jsr read_controller`
174	146		`jsr move_player`
175	147		`jsr move_enemies`
176		-	`jsr check_collisions`
	148	+	`jsr check_enemy_collisions`
	149	+	`jsr check_item_collisions`
177	150		`jsr update_all_sprites`
178	151		`jmp main_loop`
179	152
180	153		`@game_over_loop:`
181		-	`; Game over - just loop (player can see final state)`
182	154		`jmp @game_over_loop`
183	155
184		-	`; -----------------------------------------------------------------------------`
185		-	`; Initialise Game`
186		-	`; -----------------------------------------------------------------------------`
187	156		`init_game:`
188	157		`lda #STARTING_LIVES`
189	158		`sta lives`
190	159		`lda #0`
191	160		`sta game_over`
192	161		`sta invuln_timer`
	162	+	`sta items_collected`
193	163
194	164		`lda #PLAYER_START_X`
195	165		`sta player_x`
			...
197	167		`sta player_y`
198	168
199	169		`jsr init_enemies`
	170	+	`jsr init_items`
200	171		`rts`
201	172
202		-	`; -----------------------------------------------------------------------------`
203		-	`; Initialise Enemies`
204		-	`; -----------------------------------------------------------------------------`
205	173		`init_enemies:`
206	174		`lda #48`
207	175		`sta enemy_x+0`
208		-	`lda #48`
209	176		`sta enemy_y+0`
210	177		`lda #DIR_RIGHT`
211	178		`sta enemy_dir_x+0`
			...
240	207		`sta enemy_dir_y+3`
241	208		`rts`
242	209
243		-	`; -----------------------------------------------------------------------------`
244		-	`; Check Collisions`
245		-	`; -----------------------------------------------------------------------------`
246		-	`check_collisions:`
247		-	`; Skip if invulnerable`
	210	+	`init_items:`
	211	+	`; Place 4 items around the arena`
	212	+	`lda #80`
	213	+	`sta item_x+0`
	214	+	`lda #64`
	215	+	`sta item_y+0`
	216	+	`lda #1`
	217	+	`sta item_active+0`
	218	+
	219	+	`lda #168`
	220	+	`sta item_x+1`
	221	+	`lda #64`
	222	+	`sta item_y+1`
	223	+	`lda #1`
	224	+	`sta item_active+1`
	225	+
	226	+	`lda #80`
	227	+	`sta item_x+2`
	228	+	`lda #160`
	229	+	`sta item_y+2`
	230	+	`lda #1`
	231	+	`sta item_active+2`
	232	+
	233	+	`lda #168`
	234	+	`sta item_x+3`
	235	+	`lda #160`
	236	+	`sta item_y+3`
	237	+	`lda #1`
	238	+	`sta item_active+3`
	239	+	`rts`
	240	+
	241	+	`check_enemy_collisions:`
248	242		`lda invuln_timer`
249	243		`beq @check`
250	244		`dec invuln_timer`
			...
275	269		`cmp #COLLISION_DIST`
276	270		`bcs @next_enemy`
277	271
278		-	`; Collision! Lose a life`
279	272		`jsr player_hit`
280	273		`rts`
281	274
			...
285	278		`bne @check_enemy`
286	279		`rts`
287	280
288		-	`; -----------------------------------------------------------------------------`
289		-	`; Player Hit - Lose life and respawn`
290		-	`; -----------------------------------------------------------------------------`
	281	+	`check_item_collisions:`
	282	+	`ldx #0`
	283	+	`@check_item:`
	284	+	`lda item_active, x`
	285	+	`beq @next_item`
	286	+
	287	+	`lda player_x`
	288	+	`sec`
	289	+	`sbc item_x, x`
	290	+	`bpl @item_x_pos`
	291	+	`eor #$FF`
	292	+	`clc`
	293	+	`adc #1`
	294	+	`@item_x_pos:`
	295	+	`cmp #COLLECT_DIST`
	296	+	`bcs @next_item`
	297	+
	298	+	`lda player_y`
	299	+	`sec`
	300	+	`sbc item_y, x`
	301	+	`bpl @item_y_pos`
	302	+	`eor #$FF`
	303	+	`clc`
	304	+	`adc #1`
	305	+	`@item_y_pos:`
	306	+	`cmp #COLLECT_DIST`
	307	+	`bcs @next_item`
	308	+
	309	+	`; Collected!`
	310	+	`lda #0`
	311	+	`sta item_active, x`
	312	+	`inc items_collected`
	313	+
	314	+	`@next_item:`
	315	+	`inx`
	316	+	`cpx #NUM_ITEMS`
	317	+	`bne @check_item`
	318	+	`rts`
	319	+
291	320		`player_hit:`
292	321		`dec lives`
293	322		`lda lives`
294	323		`beq @game_over`
295	324
296		-	`; Respawn at start position`
297	325		`lda #PLAYER_START_X`
298	326		`sta player_x`
299	327		`lda #PLAYER_START_Y`
300	328		`sta player_y`
301	329
302		-	`; Start invulnerability`
303	330		`lda #INVULN_TIME`
304	331		`sta invuln_timer`
305	332		`rts`
			...
309	336		`sta game_over`
310	337		`rts`
311	338
312		-	`; -----------------------------------------------------------------------------`
313		-	`; Update All Sprites`
314		-	`; -----------------------------------------------------------------------------`
315	339		`update_all_sprites:`
316	340		`jsr update_player_sprite`
317	341		`jsr update_enemy_sprites`
	342	+	`jsr update_item_sprites`
318	343		`jsr update_lives_display`
319	344		`rts`
320	345
321		-	`; -----------------------------------------------------------------------------`
322		-	`; Update Player Sprite`
323		-	`; -----------------------------------------------------------------------------`
324	346		`update_player_sprite:`
325		-	`; Check if game over`
326	347		`lda game_over`
327	348		`beq @alive`
328		-	`; Hide player`
329	349		`lda #$FF`
330	350		`sta oam_buffer+0`
331	351		`rts`
332	352
333	353		`@alive:`
334		-	`; Check invulnerability flash`
335	354		`lda invuln_timer`
336		-	`beq @no_flash`
	355	+	`beq @show`
337	356		`and #%00000100`
338	357		`beq @show`
339		-	`; Hide during flash`
340	358		`lda #$FF`
341	359		`sta oam_buffer+0`
342	360		`rts`
343	361
344	362		`@show:`
345		-	`@no_flash:`
346	363		`lda player_y`
347	364		`sta oam_buffer+0`
348	365		`lda #SPRITE_PLAYER`
			...
353	370		`sta oam_buffer+3`
354	371		`rts`
355	372
356		-	`; -----------------------------------------------------------------------------`
357		-	`; Update Enemy Sprites`
358		-	`; -----------------------------------------------------------------------------`
359	373		`update_enemy_sprites:`
360	374		`ldx #0`
361		-	`ldy #4 ; Start after player sprite`
362		-
	375	+	`ldy #4`
363	376		`@loop:`
364	377		`lda enemy_y, x`
365	378		`sta oam_buffer, y`
			...
378	391		`bne @loop`
379	392		`rts`
380	393
381		-	`; -----------------------------------------------------------------------------`
382		-	`; Update Lives Display - Show life icons at top of screen`
383		-	`; -----------------------------------------------------------------------------`
384		-	`update_lives_display:`
385		-	`; OAM slots 20-31 for lives display (up to 3 lives)`
386		-	`ldy #20 ; OAM offset`
	394	+	`update_item_sprites:`
	395	+	`ldx #0`
	396	+	`ldy #20 ; OAM offset after enemies`
	397	+	`@loop:`
	398	+	`lda item_active, x`
	399	+	`beq @hide_item`
	400	+
	401	+	`lda item_y, x`
	402	+	`sta oam_buffer, y`
	403	+	`iny`
	404	+	`lda #SPRITE_ITEM`
	405	+	`sta oam_buffer, y`
	406	+	`iny`
	407	+	`lda #%00000010 ; Palette 2 (green)`
	408	+	`sta oam_buffer, y`
	409	+	`iny`
	410	+	`lda item_x, x`
	411	+	`sta oam_buffer, y`
	412	+	`iny`
	413	+	`jmp @next_item`
	414	+
	415	+	`@hide_item:`
	416	+	`lda #$FF`
	417	+	`sta oam_buffer, y`
	418	+	`iny`
	419	+	`iny`
	420	+	`iny`
	421	+	`iny`
	422	+
	423	+	`@next_item:`
	424	+	`inx`
	425	+	`cpx #NUM_ITEMS`
	426	+	`bne @loop`
	427	+	`rts`
387	428
	429	+	`update_lives_display:`
	430	+	`ldy #36 ; OAM offset for lives`
388	431		`ldx lives`
389		-	`beq @hide_all_lives`
	432	+	`beq @hide_all`
390	433
391		-	`; Show life 1`
392		-	`lda #8 ; Y position (top of screen)`
	434	+	`lda #8`
393	435		`sta oam_buffer, y`
394	436		`iny`
395	437		`lda #SPRITE_LIFE`
			...
398	440		`lda #0`
399	441		`sta oam_buffer, y`
400	442		`iny`
401		-	`lda #16 ; X position`
	443	+	`lda #16`
402	444		`sta oam_buffer, y`
403	445		`iny`
404	446
405	447		`cpx #1`
406	448		`beq @hide_rest`
407	449
408		-	`; Show life 2`
409	450		`lda #8`
410	451		`sta oam_buffer, y`
411	452		`iny`
			...
422	463		`cpx #2`
423	464		`beq @hide_rest`
424	465
425		-	`; Show life 3`
426	466		`lda #8`
427	467		`sta oam_buffer, y`
428	468		`iny`
			...
434	474		`iny`
435	475		`lda #36`
436	476		`sta oam_buffer, y`
437		-	`iny`
438	477		`rts`
439	478
440	479		`@hide_rest:`
441		-	`; Hide remaining life slots`
442		-	`@hide_loop:`
443		-	`cpy #32`
444		-	`bcs @done`
445		-	`lda #$FF`
446		-	`sta oam_buffer, y`
447		-	`iny`
448		-	`iny`
449		-	`iny`
450		-	`iny`
451		-	`jmp @hide_loop`
452		-
453		-	`@hide_all_lives:`
454		-	`ldy #20`
455		-	`jmp @hide_loop`
456		-
457		-	`@done:`
	480	+	`@hide_all:`
458	481		`rts`
459	482
460		-	`; -----------------------------------------------------------------------------`
461		-	`; Move Enemies`
462		-	`; -----------------------------------------------------------------------------`
463	483		`move_enemies:`
464	484		`ldx #0`
465		-
466	485		`@enemy_loop:`
467	486		`lda enemy_x, x`
468	487		`clc`
469	488		`adc enemy_dir_x, x`
470	489		`sta enemy_x, x`
471		-
472	490		`cmp #ARENA_LEFT`
473	491		`bcs @check_right`
474	492		`lda #DIR_RIGHT`
			...
476	494		`lda #ARENA_LEFT`
477	495		`sta enemy_x, x`
478	496		`jmp @move_y`
479		-
480	497		`@check_right:`
481	498		`cmp #ARENA_RIGHT`
482	499		`bcc @move_y`
			...
486	503		`sec`
487	504		`sbc #1`
488	505		`sta enemy_x, x`
489		-
490	506		`@move_y:`
491	507		`lda enemy_y, x`
492	508		`clc`
493	509		`adc enemy_dir_y, x`
494	510		`sta enemy_y, x`
495		-
496	511		`cmp #ARENA_TOP`
497	512		`bcs @check_bottom`
498	513		`lda #DIR_DOWN`
			...
500	515		`lda #ARENA_TOP`
501	516		`sta enemy_y, x`
502	517		`jmp @next_enemy`
503		-
504	518		`@check_bottom:`
505	519		`cmp #ARENA_BOTTOM`
506	520		`bcc @next_enemy`
			...
510	524		`sec`
511	525		`sbc #1`
512	526		`sta enemy_y, x`
513		-
514	527		`@next_enemy:`
515	528		`inx`
516	529		`cpx #NUM_ENEMIES`
517	530		`bne @enemy_loop`
518	531		`rts`
519	532
520		-	`; -----------------------------------------------------------------------------`
521		-	`; Load Palette`
522		-	`; -----------------------------------------------------------------------------`
523	533		`load_palette:`
524	534		`bit PPUSTATUS`
525	535		`lda #$3F`
			...
535	545		`bne @loop`
536	546		`rts`
537	547
538		-	`; -----------------------------------------------------------------------------`
539		-	`; Draw Arena`
540		-	`; -----------------------------------------------------------------------------`
541	548		`draw_arena:`
542	549		`bit PPUSTATUS`
543	550		`lda #$20`
544	551		`sta PPUADDR`
545	552		`lda #$00`
546	553		`sta PPUADDR`
547		-
548	554		`lda #0`
549	555		`sta row_counter`
550		-
551	556		`@draw_row:`
552	557		`lda row_counter`
553	558		`cmp #0`
			...
559	564		`cmp #29`
560	565		`beq @bottom_row`
561	566		`jmp @middle_row`
562		-
563	567		`@top_row:`
564	568		`lda row_counter`
565	569		`cmp #0`
			...
575	579		`lda #TILE_CORNER_TR`
576	580		`sta PPUDATA`
577	581		`jmp @next_row`
578		-
579	582		`@top_row_inner:`
580	583		`lda #TILE_BORDER`
581	584		`ldx #32`
			...
584	587		`dex`
585	588		`bne @top_inner_fill`
586	589		`jmp @next_row`
587		-
588	590		`@bottom_row:`
589	591		`lda row_counter`
590	592		`cmp #29`
			...
600	602		`lda #TILE_CORNER_BR`
601	603		`sta PPUDATA`
602	604		`jmp @next_row`
603		-
604	605		`@bottom_row_inner:`
605	606		`lda #TILE_BORDER`
606	607		`ldx #32`
			...
609	610		`dex`
610	611		`bne @bottom_inner_fill`
611	612		`jmp @next_row`
612		-
613	613		`@middle_row:`
614	614		`lda #TILE_BORDER`
615	615		`sta PPUDATA`
			...
623	623		`lda #TILE_BORDER`
624	624		`sta PPUDATA`
625	625		`sta PPUDATA`
626		-
627	626		`@next_row:`
628	627		`inc row_counter`
629	628		`lda row_counter`
630	629		`cmp #30`
631	630		`beq @done_drawing`
632	631		`jmp @draw_row`
633		-
634	632		`@done_drawing:`
635	633		`rts`
636	634
637		-	`; -----------------------------------------------------------------------------`
638		-	`; Set Attribute Table`
639		-	`; -----------------------------------------------------------------------------`
640	635		`set_attributes:`
641	636		`bit PPUSTATUS`
642	637		`lda #$23`
643	638		`sta PPUADDR`
644	639		`lda #$C0`
645	640		`sta PPUADDR`
646		-
647	641		`ldx #8`
648	642		`lda #$00`
649	643		`@attr_top:`
650	644		`sta PPUDATA`
651	645		`dex`
652	646		`bne @attr_top`
653		-
654	647		`ldx #6`
655	648		`@attr_floor:`
656	649		`lda #$00`
			...
666	659		`sta PPUDATA`
667	660		`dex`
668	661		`bne @attr_floor`
669		-
670	662		`ldx #8`
671	663		`lda #$00`
672	664		`@attr_bottom:`
			...
675	667		`bne @attr_bottom`
676	668		`rts`
677	669
678		-	`; -----------------------------------------------------------------------------`
679		-	`; Read Controller`
680		-	`; -----------------------------------------------------------------------------`
681	670		`read_controller:`
682	671		`lda #1`
683	672		`sta JOYPAD1`
			...
692	681		`bne @read_loop`
693	682		`rts`
694	683
695		-	`; -----------------------------------------------------------------------------`
696		-	`; Move Player`
697		-	`; -----------------------------------------------------------------------------`
698	684		`move_player:`
699	685		`lda buttons`
700	686		`and #BTN_UP`
			...
705	691		`cmp #ARENA_TOP`
706	692		`bcc @check_down`
707	693		`sta player_y`
708		-
709	694		`@check_down:`
710	695		`lda buttons`
711	696		`and #BTN_DOWN`
			...
716	701		`cmp #ARENA_BOTTOM`
717	702		`bcs @check_left`
718	703		`sta player_y`
719		-
720	704		`@check_left:`
721	705		`lda buttons`
722	706		`and #BTN_LEFT`
			...
727	711		`cmp #ARENA_LEFT`
728	712		`bcc @check_right`
729	713		`sta player_x`
730		-
731	714		`@check_right:`
732	715		`lda buttons`
733	716		`and #BTN_RIGHT`
			...
738	721		`cmp #ARENA_RIGHT`
739	722		`bcs @done`
740	723		`sta player_x`
741		-
742	724		`@done:`
743	725		`rts`
744	726
745		-	`; === NMI ===`
746	727		`nmi:`
747	728		`pha`
748	729		`txa`
749	730		`pha`
750	731		`tya`
751	732		`pha`
752		-
753	733		`lda #0`
754	734		`sta OAMADDR`
755	735		`lda #>oam_buffer`
756	736		`sta OAMDMA`
757		-
758	737		`inc frame_count`
759		-
760	738		`lda #0`
761	739		`sta PPUSCROLL`
762	740		`sta PPUSCROLL`
763		-
764	741		`pla`
765	742		`tay`
766	743		`pla`
			...
771	748		`irq:`
772	749		`rti`
773	750
774		-	`; -----------------------------------------------------------------------------`
775		-	`; Data`
776		-	`; -----------------------------------------------------------------------------`
777	751		`palette_data:`
778	752		`.byte BG_COLOUR, $11, $21, $31`
779	753		`.byte BG_COLOUR, $13, $23, $33`
780	754		`.byte BG_COLOUR, $19, $29, $39`
781	755		`.byte BG_COLOUR, $16, $26, $36`
782		-	`.byte BG_COLOUR, $30, $27, $17 ; Player + lives`
	756	+	`.byte BG_COLOUR, $30, $27, $17 ; Player`
783	757		`.byte BG_COLOUR, $16, $26, $36 ; Enemies`
784		-	`.byte BG_COLOUR, $30, $27, $17`
	758	+	`.byte BG_COLOUR, $1A, $2A, $3A ; Items (green)`
785	759		`.byte BG_COLOUR, $30, $27, $17`
786	760
787		-	`; -----------------------------------------------------------------------------`
788		-	`; Vectors`
789		-	`; -----------------------------------------------------------------------------`
790	761		`.segment "VECTORS"`
791	762		`.word nmi`
792	763		`.word reset`
793	764		`.word irq`
794	765
795		-	`; -----------------------------------------------------------------------------`
796		-	`; CHR-ROM`
797		-	`; -----------------------------------------------------------------------------`
798	766		`.segment "CHARS"`
799		-
800		-	`; Tile 0: Empty`
801		-	`.byte $00,$00,$00,$00,$00,$00,$00,$00`
802		-	`.byte $00,$00,$00,$00,$00,$00,$00,$00`
803		-
804		-	`; Tile 1: Border`
805		-	`.byte %11111111,%10000001,%10000001,%11111111`
806		-	`.byte %11111111,%00010001,%00010001,%11111111`
807		-	`.byte %00000000,%01111110,%01111110,%00000000`
808		-	`.byte %00000000,%11101110,%11101110,%00000000`
809		-
810		-	`; Tile 2: Floor`
811		-	`.byte %00000000,%00000000,%00000000,%00000000`
812		-	`.byte %00000000,%00000000,%00000000,%10000001`
813		-	`.byte %00000000,%00000000,%00000000,%00000000`
814		-	`.byte %00000000,%00000000,%00000000,%00000000`
815		-
816		-	`; Tile 3: Corner TL`
817		-	`.byte %11111111,%11000000,%10100000,%10010000`
818		-	`.byte %10001000,%10000100,%10000010,%10000001`
819		-	`.byte %00000000,%00111111,%01011111,%01101111`
820		-	`.byte %01110111,%01111011,%01111101,%01111110`
821		-
822		-	`; Tile 4: Corner TR`
823		-	`.byte %11111111,%00000011,%00000101,%00001001`
824		-	`.byte %00010001,%00100001,%01000001,%10000001`
825		-	`.byte %00000000,%11111100,%11111010,%11110110`
826		-	`.byte %11101110,%11011110,%10111110,%01111110`
827		-
828		-	`; Tile 5: Corner BL`
829		-	`.byte %10000001,%10000010,%10000100,%10001000`
830		-	`.byte %10010000,%10100000,%11000000,%11111111`
831		-	`.byte %01111110,%01111101,%01111011,%01110111`
832		-	`.byte %01101111,%01011111,%00111111,%00000000`
833		-
834		-	`; Tile 6: Corner BR`
835		-	`.byte %10000001,%01000001,%00100001,%00010001`
836		-	`.byte %00001001,%00000101,%00000011,%11111111`
837		-	`.byte %01111110,%10111110,%11011110,%11101110`
838		-	`.byte %11110110,%11111010,%11111100,%00000000`
839		-
840		-	`; Tile 7: Player`
841		-	`.byte %00011000,%00011000,%00111100,%01111110`
842		-	`.byte %11111111,%10111101,%00100100,%00100100`
843		-	`.byte %00000000,%00011000,%00011000,%00111100`
844		-	`.byte %01000010,%01000010,%00011000,%00000000`
845		-
846		-	`; Tile 8: Enemy`
847		-	`.byte %00011000,%00111100,%01111110,%11111111`
848		-	`.byte %11111111,%01111110,%00111100,%00011000`
849		-	`.byte %00000000,%00011000,%00100100,%01000010`
850		-	`.byte %01000010,%00100100,%00011000,%00000000`
851		-
852		-	`; Tile 9: Life icon (small heart/ship)`
853		-	`.byte %00000000,%00100100,%01111110,%01111110`
854		-	`.byte %00111100,%00011000,%00000000,%00000000`
855		-	`.byte %00000000,%00000000,%00000000,%00100100`
856		-	`.byte %00011000,%00000000,%00000000,%00000000`
	767	+	`.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00`
	768	+	`.byte %11111111,%10000001,%10000001,%11111111,%11111111,%00010001,%00010001,%11111111`
	769	+	`.byte %00000000,%01111110,%01111110,%00000000,%00000000,%11101110,%11101110,%00000000`
	770	+	`.byte %00000000,%00000000,%00000000,%00000000,%00000000,%00000000,%00000000,%10000001`
	771	+	`.byte %00000000,%00000000,%00000000,%00000000,%00000000,%00000000,%00000000,%00000000`
	772	+	`.byte %11111111,%11000000,%10100000,%10010000,%10001000,%10000100,%10000010,%10000001`
	773	+	`.byte %00000000,%00111111,%01011111,%01101111,%01110111,%01111011,%01111101,%01111110`
	774	+	`.byte %11111111,%00000011,%00000101,%00001001,%00010001,%00100001,%01000001,%10000001`
	775	+	`.byte %00000000,%11111100,%11111010,%11110110,%11101110,%11011110,%10111110,%01111110`
	776	+	`.byte %10000001,%10000010,%10000100,%10001000,%10010000,%10100000,%11000000,%11111111`
	777	+	`.byte %01111110,%01111101,%01111011,%01110111,%01101111,%01011111,%00111111,%00000000`
	778	+	`.byte %10000001,%01000001,%00100001,%00010001,%00001001,%00000101,%00000011,%11111111`
	779	+	`.byte %01111110,%10111110,%11011110,%11101110,%11110110,%11111010,%11111100,%00000000`
	780	+	`.byte %00011000,%00011000,%00111100,%01111110,%11111111,%10111101,%00100100,%00100100`
	781	+	`.byte %00000000,%00011000,%00011000,%00111100,%01000010,%01000010,%00011000,%00000000`
	782	+	`.byte %00011000,%00111100,%01111110,%11111111,%11111111,%01111110,%00111100,%00011000`
	783	+	`.byte %00000000,%00011000,%00100100,%01000010,%01000010,%00100100,%00011000,%00000000`
	784	+	`.byte %00000000,%00100100,%01111110,%01111110,%00111100,%00011000,%00000000,%00000000`
	785	+	`.byte %00000000,%00000000,%00000000,%00100100,%00011000,%00000000,%00000000,%00000000`
	786	+	`; Tile 10: Item (data core - diamond)`
	787	+	`.byte %00000000,%00011000,%00111100,%01111110,%01111110,%00111100,%00011000,%00000000`
	788	+	`.byte %00000000,%00000000,%00011000,%00100100,%00100100,%00011000,%00000000,%00000000`
857	789
858		-	`; Fill rest`
859		-	`.res 8192 - 160, $00`
	790	+	`.res 8192 - 176, $00`
860	791