Sonic & Knuckles Collection/Technical information

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SCHG: Sonic the Hedgehog 3 & Knuckles
Main Article
Art Editing
Editing Art Uncompressed Art Nemesis Format Art Kosinski Format Art Palette Editing Palette Locations Pattern Load Requests
Object Editing
Editing Objects Object Pointers Object Pointer List #1 Object Pointer List #2 Objects not in either list Sprite Mappings Dynamic PLCs
Level Editing
Editing Levels Object Placement Ring Placement Level Layout 16x16 Block Mappings 128x128 Block Mappings
Music Editing
Editing Music Pointer Format Header Format DAC Samples Universal Voice Bank Music Pointers (Sonic & Knuckles) Music Pointers (Sonic 3)
RAM Editing
Editing RAM Main System Memory Locations Object Status Table Format
Sonic & Knuckles Collection
Sonic & Knuckles Collection Music and sound effects

All data except for music is identical to the Mega Drive version but byteswapped (order goes 1,0,3,2 instead of 0,1,2,3).

Level data

Level layout

Main Article: SCHG:Sonic the Hedgehog 3 & Knuckles/Level Editing#Level Layout

Location	Level
259F34	Angel Island Zone Act 1
25A780	Angel Island Zone Act 2

Graphics

Art tiles

These use the standard Mega Drive format and can be edited with any tile editor.

Start Address	End Address	Description
1302B	1374A	HUD Numbers, Debug Numbers
593DC	70A7B	Tails
70A7C	73B3B	Mini Sonic
73B3C	76E5B	Mini Tails
76E5C	7A2DB	Mini Knuckles
7A46C	7D28B	Sonic Surfing (Unused)
7E180	84A3F	Invincibility Stars, Puff of Smoke, Shields
95118	95AD7	CNZ Cannon
95AD8	96257	Drowning Countdown
96258	96757	SONIC/MILES BG
E7654	E7CB3	Some Knuckles Sprites
E91F4	EAD93	Butterdroid and Cluckoid
EC4D8	ECD43	Some Knuckles Sprites?
EE198	EF838	Hyudoro
F50F0	F776F	Knuckles from HPZ cutscene
100F78	101AB7	Knuckles from SSZ
117244	117CE3	Rhinobot
11D5DC	11DFFB	Bubbles
11EE54	11FF93	Clamer
1240A8	125087	Penguinator
127E28	129147	Flybot767
1313DC	1320DB	Signpost
132D40	137C1F	more Knuckles
137CF4	13A993	Big Ring
1A2EAC	1C2DCB	Sonic
1C2F8C	1E2D0B	Knuckles
1E2F0C	1E6BAB	Sonic Extra
1E6BAC	1E94CB	Tails Extra

RAM editing

Main Article: SCHG:Sonic the Hedgehog 3 & Knuckles/RAM Editing

The RAM starts at 08FF0000.

Save file

Offset	Type	Description
180	$54 bytes	Sonic the Hedgehog 3 & Knuckles save slots (8 slots, $A bytes each) Offset Value Description $00-$01 Word Slot State $8000 New Game $0000 Game in Progress $0100 Game Complete $0200 Game Complete with all Chaos Emeralds $0300 Game Complete with all Super Emeralds $02 Byte Current Character $00 Sonic And Tails $10 Sonic $20 Tails $30 Knuckles $03 Byte Current Level $0C Last level for knuckles $0D Last level for Sonic without chaos/super emeralds, or Tails $0E Last level for Sonic with at least all Chaos Emeralds $04 Byte Unknown $05 Byte Something with Special Stages Array $06 Byte Something with Collecting a Chaos Emerald $07 Byte Something with Collecting a Super Emerald $08 Byte Current Number of lives $09 Byte Current Number of Continues Note that byte $02 also keeps a record of special stages played through, whether you won or lost it. It updates by $01s.