Sonic the Hedgehog (Sega Master System, Game Gear)/ROM map

The following article is a ROM map for Sonic the Hedgehog (Sega Master System, Game Gear).

Note that sizes are listed in decimal.

Offset	Size		Description
	----		-----------
$0003B	43		Ancient dev text
$0024B	64		Labyrinth underwater palette
$00D3D	1		Main Map Music
$00F0E  32		Main map palette
$00F2E	32		Main Map 2 palette
$00F84	255		Route data part 1
$010AB	342		Route data part 2
$01209	36		Level name pointers
$0122D	15		Green Hill text
$0123C	15		Bridge text
$0124B	15		Jungle text
$0125A	15		Labyrinth text
$01269	15		Scrap Brain text
$01278	15		Sky Base text
$012D9	1		Title Screen Music
$0133C	1		X Value of Sonic's Finger
$0133F	1		Y value of Sonic's Finger
$01352	32		Press Button text
$01372	74		Sonic's finger animation frames
$013BC	37		Sonic's finger animation Graphics
$013E1	32		Title Screen Palette
$014C1	1		Continue SFX
$014FC	32		Game over palette
$017D8	1		Chaos Emerald tally SFX
$0180D	1		Sonic Left tally SFX
$01854	1		Special Bonus tally SFX
$0197E	48		Finishing text
$01B8D	32		Level Complete Palette
$01F7D	1		Lightning (Sky Base 1 SFX)
$01F9D	16		Sky Base 1 Lightning palette
$0202E	1		Robotnik post SFX
$02036	1		Life post SFX
$02040	1		Bonus sound SFX
$023FE	3		Time you start with
$02401	3		Time you start with after hitting down box and dying
$02405	24		Times for bonus levels
$02609	1		Chaos Emeralds released Jingle
$02703	2		Credits palette pointer
$02709	1		Credits Music
$02905	465		Credits text
$02AD6	32		Credits palette
$02AF6	172		Sprites pointers
$02BA2	unknown		Demo data
$0321A	2		Demo data pointer
$03641	1		Death Music
$036BB	1		Sonic hurt SFX
$036EE	1		Hit enemy & monitors SFX
$039CE	1		Life gained (100 rings) SFX
$039D5	1		Ring (also post) SFX
$03A00	1		Life (50000 points gained) sound effect
$03A65	16		Block collision data pointers
$03A75	184		Green Hill block Collision data
$03B2D	144		Bridge block Collision data
$03BBD	160		Jungle block Collision data
$03C5D	176		Labyrinth block Collision data
$03D0D	187		Scrap Brain block collision data
$03DC8	224		Sky Base outside block Collision data
$03EA8	128		Bonus block Collision data
$03F28	104		Sky Base inside block Collision data
$05042	1		Death Drowned Music
$0506A	1		Labyrinth countdown SFX
$0509E	1		Sonic's jump height when you hold button
$050A3	1		Jumping SFX
$050DC	1		Sonic spin SFX
$051FE	1		Sonic screech SFX
$054BC	10		Open air data
$054C6	8		Spike data?
$054CE	65		Sonic rolling launch (green hill) data ($550C SFX)
$0550F	30		Left spring data ($552A SFX)
$0552D	41		up spring right side data ($5553 SFX)
$05556	34		Right spring data ($5575 SFX)
$05578	24		Conveyor belt left data
$05590	24		Conveyor belt right data
$055A8	14		Sonic in Water physics data ($55AF SFX)
$055B6	44		up spring middle data ($55DF SFX)
$055E2	9		Whistle through block GHZ2 data ($55E8 SFX)
$055EB	113		Teleport data ($5639 SFX)
$0565C	32		Sonic in shallow water physics data
$0567C	42		Labyrinth Water flow right Sonic data?
$056A6	16		Labyrinth Water flow right Sonic data?
$056B6	16		Labyrinth Water flow left Sonic data?
$056C6	16		Labyrinth Water flow left Sonic data?
$056D6 	139		Star bumper data ($5724 SFX)
$05761	16		Purple spring data ($576E SFX)
$05771	16		Orange spring data ($577E SFX)
$05781	16		Green spring data ($578E SFX)
$05791	60		Pink Bumper data? ($57CA SFX)
$057CD	41		Long Bumper data?
$057F6	18		? data
$05808	67		Bridge falling data?
$0584B	133		Bridge falling data?
$058D0	21		? data
$058E5	56		Sonic block physics pointers
$0591D	64		Sonic tilemap data
$0595D	8		Ring collected data
$05965	52		Sonic sprite data pointers
$05999	50		Sonic moving sprite data
$059CB	18		Sonic max speed sprite data
$059DD	2		? data
$059DF	3		Sonic slowing down sprite data
$059E2	3		Sonic stand still sprite data
$059E5	22		Sonic spin/jump sprite data
$059FB	3		Sonic duck sprite data
$059FE	3		Sonic movement stuck sprite data
$05A01	82		Sonic Rolling/jump slow mo sprite data?
$05A53	18		Sonic slowing down 2 sprite data
$05A65	3		Sonic death sprite data
$05A68	3		Sonic looking up sprite data
$05A6B	68		Sonic impatient sprite data
$05AAF	22		Sonic teleport sprite data
$05AC5	7		Sonic fast spin sprite data
$05ACC	4		Sonic takes damage sprite data
$05AD0	14		Sonic Labyrinth water ride sprite data 
$05ADE	3		Sonic movement stuck sprite data 2
$05AE1	3		Sonic spring up sprite data
$05AE4	3		Sonic Breathe bubble sprite data
$05AE7	3		Sonic drowned sprite data
$05AEA	22		Sonic Teleport out sprite data
$05B00	3		Sonic teleported out sprite data
$05B03	3		Sonic teleport white sprite data
$05B06	3		Sonic teleport white 2 sprite data
$05B09	208		Super Ring monitor data
$05BD9	44		Power Sneakers monitor data
$05C05	210		Extra life monitor data ($5C4D SFX)
$05CD7	40		Shield Monitor data
$05CFF	48		Invincibility Monitor data ($5D24 Music)
$05D2F	81		Checkpoint Monitor data
$05D80	290		Continue Monitor data
$05EA2	117		Chaos Emerald data ($5EDC SFX)
$05F17	869		End post data ($5FCF Level complete, $5FD2 Post lands SFX, 
			$602E Spinning Post SFX, $626C Post Palette)
$0627C	34		Level palette pointers
$0629E	32		Green hill load palette
$062BE	48		Green Hill auto palette
$062EE	32		Bridge load palette
$0630E	48		Bridge auto palette
$0633E	32		Jungle load palette
$0635E	48		Jungle auto palette
$0638E	32		Labyrinth load palette
$063AE	48		Labyrinth auto palette
$063DE	32		Scrap Brain load palette
$063FE	64		Scrap Brain auto palette
$0643E	32		Sky Base load palette
$0645E	64		Sky Base auto palette
$0649E	64		Sky Base lightning charge auto palette
$064DE	64		Sky Base lightning fire auto palette
$0651E	64		Sky Base 2 auto palette
$0655E	32		Bonus load palette
$0657E	16		Bonus auto palette
$0658E	32		Sky Base 3/Inside load palette
$065AE	64		Sky Base 3/Inside auto palette

$065EE	334		Crab enemy data ($666A Claw SFX)
$0673C	515		Swinging platform data
$0693F	170		Enemy/monitor destroyed (smoke) data
$069E9	94		Lowering platform data
$06A47	122		Falling platform data
$06AC1	179		Crab fireball data
$06B74	497		Buzz Bomber data ($6C92 Pojectile SFX)
$06D65	167		Left and right platform data
$06E0C	252		Motobug data
$06F08	260		Newtron data ($6FAF Projectile SFX)
$0700C	800		Green Hill Boss data? ($7045 Boss music, $731C Boss Sprite palette)
$0732C	616		Animal Cell data ($7487 Act Complete music)
$07594	261		Free Bird data
$07699	293		Free Rabbit data
$077BE	745		Non sprite other robotnik data ($7818 Robotnik hit SFX,
			$7AA4 Robotnik beaten SFX)
$07AA7	70		Green Hill 2 fake hurt object data
$07AED	168		Green Hill growing flower sprite data
$07B95	353		Sonic hurt data
$07CF6	268		Piranha data ($7D54 SFX)
$07E02	153		Vertical Jungle log data
$07E9B	75		Horizontal Jungle log data
$07EE6	365		Floating log data
$08053	453		Jungle boss data ($8088 Music)
$08218	206		related to Jungle boss data ($829E Bomb SFX)
$082E6	219		Yadrin data
$083C1	213		Falling bridge data ($8425 SFX)
$08496	470		Bridge boss data ($84D4 Music, $85A5 Projectile SFX)
$0866C	459		Seesaw data ($8705 SFX)
$08837	196		Jaws data
$088FB	507		Rotating Spike Ball data
$08AF6	288		Labyrinth Spike pole data ($8BB9 SFX)
$08C16	132		Labyrinth fireball data ($8C8B SFX)
$08D48	270		Labyrinth Water object data
$08E56	116		Labyrinth Bubble maker data
$08ECA	162		Labyrinth small Bubble data
$08F6C	1		? data
$08F6D	339		Burrowbot data
$090C0	423		Labyrinth lifting platform data
$09267	574		Labyrinth boss data ($92A9 Music, $9476 Projectile SFX)
$094A5	515		Labyrinth Boss Rocket data
$096A8	80		Labyrinth Boss Rocket moving data
$096F8	366		Labyrinth big Bubble data ($97E1 Breathing SFX)
$09866	661		Flipper data
$09AFB	122		Pink Bumper data ($9B67 SFX)
$09B75	115		Warp door data
$09BE8	136		Fireball right data ($9C13 Not in view SFX, $9C55 SFX)
$09C70	30		Fireball left data
$09C8E	364		Flame thrower data ($9D47 SFX)
$09DFA	360		Auto door left data ($9EC1 Raise SFX, $9ED1 Lower SFX)
$09F62	195		Auto door right data
$0A025	195		Auto door both ways data
$0A0E8	194		Electric Sphere data ($A128 SFX)
$0A1AA	402		Ball Hog data
$0A33C	188		Bouncing ball from Ball Hog data
$0A3F8	179		Switch data
$0A4AB	166		Switch activated door data ($A460 SFX)
$0A551	668		Caterkiller data
$0A7ED	474		Scrap Brain Boss data ($A82A Music, $A9B4 Platform rise SFX)
$0A9C7	163		Sky Base passing cloud data
$0AA6A	183		Propeller data
$0AB21	587		Bomb badnik data ($AC1A SFX)
$0AD6C	201		Cannon data
$0AE35	83		Cannon projectile data
$0AE88	620		Unidus data
$0B0F4	120		? (Exists) data
$0B16C	299		Rotating Cannon data
$0B297	257		Flying platform data
$0B398	213		Moving Spiked Wall data
$0B46D	161		small cannon data
$0B50E	294		Rise & Fall platform data ($B631 Turret SFX)
$0B634	unknown		Sky Base boss data?
$0B68D	1		Sky Base Boss Music
$0B7CB	1		Hits before glass breaks
$0B7E3	1		Glass break SFX
$0B81A	1		Glass hit SFX
$0BA49	177		Glass break tiles
$0BAFA	138		Robotnik in teleporter tilemap
$0BB84	347		Lightning wall data ($BC2F Hits before wall change, $BC56 Lightning 1 SFX,
			$BCA2 Lightning 2 SFX, $BCC7 Tiles used)
$0BCDF	282		Plasma ball data
$0BDF9	339		Robotnik & Sonic ending object data ($BE5A Teleport out SFX)
$0BF4C	172		Sonic 6 Emeralds object data
$0BFF8	8		Empty
$0C000	1814		Instrument data?
$0C716	42		Music data pointers
$0C740	144		SFX data pointers
$0C7D0	1338		Green Hill Music
$0CD0A	1344		Hidden Marble Zone Music
$0D24A	1280		Jungle Music
$0D74A	1029		Bridge Music
$0DB4F	1624		Scrap Brain Music
$0E1A7	796		Sky Base Music
$0E4C3	377		Title Screen Music
$0E63C	200		Map SFX
$0E704	432		Invincibility Music
$0E8B4	221		Act Complete Music
$0E991	303		Death Music
$0EAC0	660		Boss Music
$0ED54	984		Ending Music
$0F12C	1248		Bonus Music
$0F60C	896		Labyrinth Music
$0F98C	154		Chaos Emeralds released [SFX]
$0FA26	257		Chaos Emerald [SFX]
$0FB27	28		Jumping SFX
$0FB43	49		Hit enemy SFX
$0FB74	36		Ring SFX
$0FB98	39		Screech SFX
$0FBBF	39		Spring SFX
$0FBE6	50		Whistle/Roll on ramp SFX
$0FC18	42		Rolling SFX
$0FC42	28		Bumper SFX
$0FC5E	48		Unused 08 SFX
$0FC8E	41		Extra Life SFX
$0FCB7	33		Enemy Shot SFX
$0FCD8	37		Spinning Post SFX
$0FCFD	39		Post lands SFX
$0FD24	62		Unused 0D SFX
$0FD62	38		Hurt SFX
$0FD88	41		Water SFX
$0FDB1	53		Lightning SFX
$0FDE6	38		Fire SBZ SFX
$0FE0C	35		Fireball/Bridge piece falling SFX
$0FE2F	25		Door raise SFX
$0FE48	20		Switch/Countdown SFX
$0FE5C	24		Pressure Noise SFX
$0FE74	48		Cannon SFX
$0FEA4	40		LZ Spike Raise SFX
$0FECC	28		Unused 1E SFX
$0FEE8	32		Fireball/Bridge piece falling SFX 2
$0FF08	70		Glass break SFX
$0FF4E	53		Sonic Bubble SFX
$0FF83	46		Unused 23 SFX
$0FFB1	79		Empty
$10000	2944		Green Hill 8x8 -> 32x32 block gfx
$10B80	2304		Bridge 8x8 -> 32x32 block gfx
$11480	2560		Jungle 8x8 -> 32x32 block gfx
$11E80	2816		Labyrinth 8x8 -> 32x32 block gfx
$12980	3072		Scrap Brain 8x8 -> 32x32 block gfx
$13580	3456		Sky Base 1,2 8x8 -> 32x32 block gfx
$14300	1664		Sky Base 3 8x8 -> 32x32 block gfx
$14980	2048		Bonus 8x8 -> 32x32 block gfx
$15180	1024		Item box, emerald art
$15580	2		Green Hill 1 L.H. pointer
$15582	2		Green Hill 2 L.H. Pointer
$15584	2		Green Hill 3 L.H. Pointer
$15586	2		Bridge 1 L.H. Pointer
$15588	2		Bridge 2 L.H. Pointer
$1558A	2		Bridge 3 L.H. Pointer
$1558C	2		Jungle 1 L.H. Pointer
$1558E	2		Jungle 2 L.H. Pointer
$15590	2		Jungle 3 L.H. Pointer
$15592	2		Labyrinth 1 L.H. Pointer
$15594	2		Labyrinth 2 L.H. Pointer
$15596	2		Labyrinth 3 L.H. Pointer
$15598	2		Scrap Brain 1 L.H. Pointer
$1559A	2		Scrap Brain 2 L.H. Pointer
$1559C	2		Scrap Brain 3 L.H. Pntr
$1559E	2		Sky Base 1 L.H. Pntr
$155A0	2		Sky Base 2 L.H. Pntr
$155A2	2		Sky Base 3 L.H. Pntr
$155A4	2		Ending L.H. Pntr
$155A6	2		Empty
$155A8	2		SB 2 Area 1 -> 2 L.H. Pntr
$155AA	2		SB 2 Area 1 -> 3 L.H. Pntr
$155AC	2		SB 2 Area 2 -> 1 [TP] L.H. Pntr
$155AE	2		SB 2 Area 2 -> 3 [TP] L.H. Pntr
$155B0	2		SB 2 Area 2 -> 1 L.H. Pntr
$155B2	2		SB 2 Area 3 -> 1 L.H. Pntr
$155B4	2		Sky Base 2 area 2 L.H. Pntr
$155B6	2		Sky Base 2 area 2 L.H. Pntr 2
$155B8	2		Bonus 1 L.H. Pntr
$155BA	2		Bonus 2 L.H. Pntr
$155BC	2		Bonus 3 L.H. Pntr
$155BE	2		Bonus 4 L.H. Pntr
$155C0	2		Bonus 5 L.H. Pntr
$155C2	2		Bonus 6 L.H. Pntr
$155C4	2		Bonus 7 L.H. Pntr
$155C6	2		Bonus 8 L.H. Pntr
$155C8	2		Empty
$155CA	37		Green Hill 1 Level Header
$155EF	37		Green Hill 2 Level Header
$15614	37		Green Hill 3 Level Header
$15639	37		Ending Level Header
$1565E	37		Bridge 1 Level Header
$15683	37		Bridge 2 Level Header
$156A8	37		Bridge 3 Level Header
$156CD	37		Jungle 1 Level Header
$156F2	37		Jungle 2 Level Header
$15717	37		Jungle 3 Level Header
$1573C	37		Labyrinth 1 Level Header
$15761	37		Labyrinth 2 Level Header
$15786	37		Labyrinth 3 Level Header
$157AB	37		Scrap Brain 1 Level Header
$157D0	37		Scrap Brain 2 Level Header
$157F5	37		SB 2 Area 1 -> 2 Level Header
$1581A	37		SB 2 Area 1 -> 3 Level Header
$1583F	37		Scrap Brain 3 Level Header
$15864	37		SB 2 Area 2 -> 1 Level Header
$15889	37		SB 2 Area 3 -> 1 Level Header
$158AE	37		SB 2 Area 2 -> 1 [TP] Level Header
$158D3	37		SB 2 Area 2 -> 3 [TP] Level Header
$158F8	37		Sky Base 1 Level Header
$1591D	37		Sky Base 2 Level Header
$15942	37		Sky Base 3 Level Header
$15967	37		Sky Base 2 Area 2 Level Header
$1598C	37		Bonus 1 Level Header
$159B1	37		Bonus 2 Level Header
$159D6	37		Bonus 3 Level Header
$159FB	37		Bonus 4 Level Header
$15A20	37		Bonus 5 Level Header
$15A45	37		Bonus 6 Level Header
$15A6A	37		Bonus 7 Level Header
$15A8F	37		Bonus 8 Level Header
$15AB4	76		Green Hill 1 Sprites
$15B00	67		Green Hill 2 Sprites
$15B43	19		Green Hill 3 Sprites
$15B56	70		Bridge 1 Sprites
$15B9C	58		Bridge 2 Sprites
$15BD6	22		Bridge 3 Sprites
$15BEC	88		Jungle 1 Sprites
$15C44	73		Jungle 2 Sprites
$15C8D	22		Jungle 3 Sprites
$15CA3	79		Labyrinth 1 Sprites
$15CF2	88		Labyrinth 2 Sprites
$15D4A	31		Labyrinth 3 Sprites
$15D69	67		Scrap Brain 1 Sprites
$15DAC	61		Scrap Brain 2 Sprites
$15DE9	76		Scrap Brain 2 area 2 Sprites
$15E35	25		Scrap Brain 2 area 3 Sprites
$15E4E	76		Scrap Brain 3 Sprites
$15E9A	58		Sky Base 1 Sprites
$15ED4	67		Sky Base 2 Sprites
$15F17	10		Sky Base 3 Sprites
$15F21	4		Sky Base 2 area 2 sprites
$15F25	7		Bonus Stage 1 Sprites
$15F2C	10		Bonus Stage 2 Sprites
$15F36	10		Bonus Stage 3 Sprites
$15F40	19		Bonus Stage 4 Sprites
$15F53	19		Bonus Stage 5 Sprites
$15F66	25		Bonus Stage 6 Sprites
$15F7F	22		Bonus Stage 7 Sprites
$15F95	47		Bonus Stage 8 Sprites
$15FBA	10		Ending Sprites
$15FC4	60		Empty
$16000	302		Title Screen 8x8 tilemap
$1612E	187		Passed act 8X8 tilemap
$161E9	149		Special stage finished 8x8 tilemap
$1627E	376		Map 1 8x8 tilemap
$163F6	325		Map 1 8x8 tilemap related/beta?
$1653B	368		Map 2 8x8 tilemap
$166AB	339		Map 2 8x8 tilemap related/beta?
$167FE	44		Game Over 8x8 tilemap
$16830	379		Bad End map 8x8 tilemap
$169AB	323		Good End map 8x8 tilemap
$16AEE	371		Credits 8x8 tilemap related/beta?
$16C61	393		Credits 8x8 tilemap
$16DEA	2110		Green Hill 1 Level Layout & Ending
$17628	1633		Green Hill 2 Level Layout
$17C89	813		Green Hill 3 Level Layout
$17FB6	2732		Jungle 1 Level Layout
$18A62	754		Bonus 4 Level Layout
$18D54	1513		Jungle 2 Level Layout
$1933D	1690		Scrap Brain 1 Level Layout
$199D7	2308		Scrap Brain 2 Level Layout
$1A2DB	2296		Scrap Brain 2c Level Layout
$1ABD3	1711		Scrap Brain 2b Level Layout
$1B282	2226		Scrap Brain 3 Level Layout
$1BB34	925		Sky Base 2a Level Layout
$1BED1	1684		Bridge 1 Level Layout
$1C565	2242		Labyrinth 1 Level Layout
$1CE27	3347		Labyrinth 2 Level Layout
$1DB3A	1902		Sky Base 1 Level Layout
$1E2A8	1177		Bridge 2 Level Layout
$1E741	914		Sky Base 3 Level Layout
$1EAD3	302		Sky Base 2b Level Layout
$1EC01	1013		Jungle 3 Level Layout
$1EFF6	761		Labyrinth 3 Level Layout
$1F301	320		Bridge 3 Level Layout
$1F441	778		Bonus 1 Level Layout
$1F74B	606		Bonus 2 Level Layout
$1F9A9	505		Bonus 3 Level Layout
$1FBA2	1118		empty data
$20000	24576		Sonic art compressed?
$26000	5407		Title Screen Compressed art
$2751F	3445		"Sonic Has Passed" Screen Compressed art
$28294	2166		End Sign Compressed art
$28B0A	1889		Title Screen Animated Finger Compressed art
$2926B	1751		Map Screen 1 Compressed art
$29942	2024		Map Screen 2 Compressed art
$2A12A	2835		Green Hill sprites Compressed art
$2AC3D	2960		Bridge sprites Compressed art
$2B7CD	3049		Jungle sprites Compressed art
$2C3B6	3007		Labyrinth sprites Compressed art
$2CF75	2667		Scrap Brain sprites Compressed art
$2D9E0	2865		Sky Base sprites Compressed art
$2E511	2464		Special Stage sprites Compressed art
$2EEB1	2685		Boss sprites Compressed art
$2F92E	1090		HUD Compressed art
$2FD70	640		Ring Animation Compressed art
$2FFF0	16		Empty
$30000	6145		Map Screen 1 Compressed art
$31801	6117		Map Screen 2 / Credits Screen Compressed art
$32FE6	43586		Level art compressed, headers, unique & duplicate rows
$3FF21	223		Empty