Sonic the Hedgehog 2 (16-bit)/Object Editing/Pointers

Sonic Community Hacking Guide Sonic the Hedgehog 2 (16-bit)
Art
Uncompressed art Nemesis format art Kosinski format art Palette editing Pattern load requests
Objects
Sounds and objects Object Pointer list Sprite mappings Dynamic PLCs
Levels
Object placement Ring placement Level layout 16x16 block mappings 128x128 block mappings Level specific info
Text
Two-player mode text Options text Level select text © 1992 SEGA text Credits/iIntro text Title card text
Music
Pointer format Header format DAC samples Master playlist and compression Music pointers
RAM
Main system memory locations Object status table format
Miscellaneous
Game configuration Cheats editings Debug mode Demo recording

This pointer index can be found at $1600C-$1637C. Each pointer is an absolute longword value. Every object has exactly one pointer associated with it, and this pointer leads to the start of the object's code.

The ID number is hex, and denotes the object's position in the list. Code is value of the actual pointer. Mappings tells where to find the object's sprite mappings, and Subparameters tells what arguments, if any, the object can take when it's placed on the playfield.

FIXME: More subparameters! 

ID #	Description	Code	Mappings	Subparameters
01	Sonic	$19F50	$6FBE0
02	Tails	$1B8A4	$7446C
03	Collision plane switcher	$1FCDC	$1FFB8	$00 - L0 R0 (4 Blocks) $01 - L0 R0 (8 Blocks) $02 - L0 R0 (16 Blocks) $03 - L0 R0 (32 Blocks) $04 - U0 D0 (4 Blocks) $05 - U0 D0 (8 Blocks) $06 - U0 D0 (16 Blocks) $07 - U0 D0 (32 Blocks) $08 - L0 R1 (4 Blocks) $09 - L0 R1 (8 Blocks) $0A - L0 R1 (16 Blocks) $0B - L0 R1 (32 Blocks) $0C - U0 D1 (4 Blocks) $0D - U0 D1 (8 Blocks) $0E - U0 D1 (16 Blocks) $0F - U0 D1 (32 Blocks) $10 - L1 R0 (4 Blocks) $11 - L1 R0 (8 Blocks) $12 - L1 R0 (16 Blocks) $13 - L1 R0 (32 Blocks) $14 - U1 D0 (4 Blocks) $15 - U1 D0 (8 Blocks) $16 - U1 D0 (16 Blocks) $17 - U1 D0 (32 Blocks) $18 - L1 R1 (4 Blocks) $19 - L1 R1 (8 Blocks) $1A - L1 R1 (16 Blocks) $1B - L1 R1 (32 Blocks) $1C - U1 D1 (4 Blocks) $1D - U1 D1 (8 Blocks) $1E - U1 D1 (16 Blocks) $1F - U1 D1 (32 Blocks)
04	Water surface	$208DC	$20A0E
05	Tails' tails	$1D200	$739E2
06	Rotating cylinder in Metropolis Zone, twisting pathway in Emerald Hill Zone	$214C4	$?????
07	Oil (stretches across entire map)	$24020	$?????
08	Water splash in Aquatic Ruin Zone, Spin Dash dust	$1DD20	$1DF5E
09	Sonic in Special Stage	$338EC	$34212
0A	Small bubbles from Sonic's face while underwater	$1D320	$1FBF6
0B	Section of pipe from Chemical Plant Zone	$2009C	$201A0
0C	Small floating platform (unused)	$20210	$202FA
0D	End of level sign post	$191B8	$19656
0E	Flashing stars from intro	$12E18	$136A8
0F	Title screen menu	$13600	$13B70
10	Tails in Special Stage	$347EC	$34B3E
11	Bridge in Emerald Hill Zone and Hidden Palace Zone	$F66C	$FC70 $FC28	$08 - 8 block bridge $0A - 10 block bridge $0C - 12 block bridge $0E - 14 block bridge $10 - 16 block bridge
12	Emerald from Hidden Palace Zone	$2031C	$20382
13	Waterfall in Hidden Palace Zone	$203AC	$20528
14	See saw from Hill Top Zone	$21928	$21CF0
15	Swinging platform from Aquatic Ruin Zone	$FC9C	$101E8
16	Diagonally moving lift from Hill Top Zone	$21DAC	$21F14
17	Unknown (animated/hurtable object)	$10310	$10452
18	Moving platform from Emerald Hill Zone and Aquatic Ruin Zone	$104AC	$107F6 $1084E	$00 - Static $01 - Move left and right $02 - Moves up and down $03 - Falling
19	Platform from Chemical Plant Zone, Oil Ocean Zone and Wing Fortress Zone	$22018	$2222A	$00 - Move left and right (CPZ) $01 - Move left and right (CPZ) $02 - Move up and down slowly (CPZ) $03 - Moves up when stepped on (CPZ) $04 - Moves up automatically (CPZ) $05 - Still (CPZ) $06 - Move up and down quickly (CPZ) $07 - Move down and up quickly (CPZ) $08 - Move in a circle #1 (CPZ) $09 - Move in a circle #2 (CPZ) $0A - Move in a circle #3 (CPZ) $0B - Move in a circle #4 (CPZ) $0C - Move in a circle #1 (clockwise) (CPZ) $0D - Move in a circle #2 (clockwise) (CPZ) $0E - Move in a circle #3 (clockwise) (CPZ) $0F - Move in a circle #4 (clockwise) (CPZ) $10-$1F (Same as $00 to 0F, but smaller platform) (CPZ) $20-$2F (Same as $00 to 0F, but longer platform) (OOZ) $30-$3F (Same as $00 to 0F) (WFZ)
1A	Collapsing platform in Oil Ocean Zone	$108BC	$10C6C
1B	Speed booster from Chemical Plant Zone	$222AC	$223E2	$00
1C	Bridge stake in Emerald Hill Zone and Hill Top Zone, falling oil in Oil Ocean Zone	$111D4	$?????
1D	Blue balls in Chemical Plant Zone	$22408	$22576
1E	Spin tube from Chemical Plant Zone	$2259C	$?????
1F	Collapsing platform	$10A08	$10F0C $110C6 $11106 $1115E
20	Lava bubble from Hill Top Zone	$22FF8	$23254
21	Score/Rings/Time display	$80BE	$8146
22	Arrow shooter from Aquatic Ruin Zone	$25694	$25804
23	Pillar that drops its lower part from Aquatic Ruin Zone	$2588C	$259E6
24	Bubbles in Aquatic Ruin Zone	$1F8A8	$1FBF6
25	Ring	$11F44	$12382
26	Monitor	$12670	$12D36	$00 - Static (harms Sonic) $01 - Sonic 1-up $02 - Tails 1-up $03 - Robotnik $04 - Super Ring $05 - Super Shoes $06 - Shield $07 - Invincibility $08 - Teleport $09 - Question mark (random) $0A - Broken
27	Explosion of an enemy	$21088	$21120
28	Animal and the 100 points from a badnik	$1188C	$?????
29	"100 points" text	$11DC6	$11ED0
2A	Stomper from Mystic Cave Zone	$115C4	$11666
2B	Rising pillar from Aquatic Ruin Zone	$25A5A	$25C6E
2C	Falling leaves from Aquatic Ruin Zone	$26104	$20E74
2D	One way barrier	$1169A	$11822
2E	Monitor contents (code for power-up behavior and rising image)	$12854	$12D36
2F	Smashable ground in Hill Top Zone	$23300	$236FA
30	Large rising lava during earthquake in Hill Top Zone	$238DC	$?????
31	Lava collision marker	$20DEC	$20E6E
32	Breakable rock from Chemical Plant Zone and Hill Top Zone	$2351A	$23852 $23886
33	Green platform from Oil Ocean Zone	$23AF4	$23DDC
34	Title card	$13C48	$147BA
35	Invincibility Stars	$1D97E	$1DB42
36	Spikes	$15900	$15B68	The first nybble can be set in the range $0-$3 and sets the spike style. The second nybble is a flag - if set, the spikes shift up and down, if clear, the spikes are static.
37	Scattering rings (generated when Sonic is hurt and has rings)	$12078	$12382
38	Shield	$1D8F2	$1DBE4
39	Game/Time Over text	$13F74	$14C6C
3A	End of level result screen	$14086	$14CBC
3B	Solid block	$15CC8	$15D2E
3C	Breakable wall (leftover from S1)	$15D44	$15ECC
3D	Oil Ocean Zone sphere transporter launcher	$24DD0	$250BA
3E	Egg prison	$3F1E4	$3F436	$00
3F	Fan from Oil Ocean Zone	$2A7B0	$2AA12
40	Pressure spring from CPZ and ARZ (the red "diving board" spring)	$26370	$265F4
41	Spring	$18888	$1901C $19032	The first nybble determines the orientation: $0 - facing up $1 - facing to the side $2 - facing down $3 - facing diagonally up and to the right $4 - facing diagonally down and to the right Bit 6 ($2) determines the color: 0 is red, 1 is yellow Bit 7 ($1) determines the animation used: 0 is the normal spring animation, 1 is the twirling animation
42	Steam Spring from Metropolis Zone	$26634	$2686C
43	Sliding spike obsticle thing from Oil Ocean Zone	$23E40	$23FE0
44	Round bumper from Casino Night Zone	$1F730	$1F85A
45	Pressure spring from Oil Ocean Zone	$240F8	$2451A
46	Ball from Oil Ocean Zone (unused, beta leftover)	$24A16	$24C52
47	Button	$24CF4	$24D96
48	Sphere Transporter from Oil Ocean Zone	$25244	$254FE	Note: All of these were tested with x-flip OFF. Most of the Sphere transporters in stock Sonic 2 are implemented in with x-flip ON. $00 - Launches the player right $01 - Launches the player down $02 - Launches the player left $03 - Launches the player up $8x merely launch the player at a set speed of $1000 in any direction, allowing the player to touch the ground after launch. $80 - Launches the player right $81 - Launches the player down $82 - Launches the player left $83 - Launches the player up
49	Waterfall from EHZ	$20B9E	$20C50
4A	Octus (octopus badnik) from Oil Ocean Zone	$2CA14	$2CBFE
4B	Buzzer from EHZ	$2D068	$2D2EA	$00
4C	Bat from HPZ (removed)	$1637C	$?????
4D	Stegobot from HPZ (removed)	$1637C	$?????
4E	Gator from HPZ (removed)	$1637C	$?????
4F	Dinosaur from HPZ (removed)	$1637C	$?????
50	Aquis (seahorse badnik) from OOZ	$2CCC8	$2CF94
51	Casino Night Zone boss	$318F0	$320EA
52	Hill Top Zone boss	$2FC50	$302BC
53	Shield orbs that surround Metropolis Zone boss	$32940	$32DC6
54	Metropolis Zone boss	$32288	$32DC6
55	Oil Ocean Zone boss	$32F90	$33756
56	Emerald Hill Zone boss	$2EF18	$2FAF8
57	Mystic Cave Zone boss	$30FA4	$316EC
58	Boss explosion	$2D494	$2D50A
59	Emerald from Special Stage	$35FBC	$3625A
5A	Messages/checkpoint from Special Stage	$35554	$3632A
5B	Scattering rings in Special Stage	$353FE	$3632A
5C	Masher (jumping piranha badnik) from Emerald Hill Zone	$2D394	$2D442	$00
5D	Chemical Plant Zone boss	$2D734	$2ED8C
5E	HUD from Special Stage	$6FC0	$7070
5F	Start banner/"Ending controller" from Special Stage	$70F0	$?????
60	Rings from Special Stage	$34FA0	$3632A
61	Bombs from Special Stage	$34EB0	$36508
62	Null object	$1637C	$?????
63	Character shadow from Special Stage	$340A4	$34492
64	Twin stompers from Metropolis Zone	$26920	$26A5C
65	Long moving platform from Metropolis Zone	$26AE0	$26EC8	$13 - Invisible bridge activated after passing it $B0 - Moving bridge activated by buttons
66	Yellow spring walls from Metropolis Zone	$26F58	$27120
67	Warp tubes from Metropolis Zone	$2715C	$27548
68	Block with four retracting spikes from Metropolis Zone	$27594	$27750
69	Nut from Metropolis Zone	$27884	$27A26
6A	Platform from Metropolis Zone, moves when you walk off	$27AB0	$26EC8
6B	Platform from Metropolis Zone, doesn't move	$27D6C	$26EC8
6C	Small platform, going up and right (unused)	$28034	$28372
6D	Floor spike from Metropolis Zone	$27794	$27750
6E	Small platform, moving in a circle (unused)	$283AC	$2852C
6F	End of special stage result screen	$143C0	$14ED0
70	Giant rotating cog from Metropolis Zone	$285C0	$28786
71	Bridge stake and pulsing orb from Hidden Palace Zone	$112F0	$11396 $11576
72	Conveyor belt from Casino Night Zone	$2893C	$?????
73	Solid rotating ring thing from Mystic Cave Zone (unused, can be seen in debug mode)	$289D4	$28B9C
74	Invisible solid block	$20EE0	$20F66	(blocks = 16x16) First nibble determines width, and second nibble determines height. Examples: $00 would be one block. $04 would be one block wide five blocks blocks tall. $08 would be one block wide nine blocks blocks tall. $52 would be six blocks wide and three blocks tall.
75	Brick from Mystic Cave Zone	$28BC8	$28D8A
76	Spike block from Mystic Cave Zone (slides out of wall when Sonic gets near)	$28DF8	$28F3A
77	Bridge from Mystic Cave Zone	$28F88	$29064
78	Stairs from Chemical Plant Zone that move down to open the way	$291CC	$2800E	$00 - Moves down after sonic stands on it $01 - Moves down automatically $02 - Horizontal, non moving $04 - Moves up after Sonic stands on it $05 - Moves up automatically
79	Star pole	$1F0B4	$1F424	The designation number of the star pole, from $00-$09. Used to determine order - if you hit pole $04 before you've hit $03, the game will behave as if you did hit $03, even if you never actually go near it.
7A	Small yellow platform in Chemical Plant Zone	$293A0	$29564 $10256
7B	Warp pipe exit spring from Chemical Plant Zone	$29590	$29780
7C	Big pylon thing that's in the foreground in Chemical Plant Zone	$20FD2	$2103C
7D	Points that can be gotten at the end of an act (leftover from S1)	$1F624	$1F6FE
7E	Super Sonic's stars	$1E0F0	$1E1BE
7F	Vine switch that you hang off in Mystic Cave Zone	$297E4	$29938
80	Elevator vine from Mystic Cave Zone and Wing Fortress Zone (lifts or lowers Sonic)	$2997C	$29DD0
81	Long invisible vertical barrier	$2A000	$2A24E
82	Swinging platform in Aquatic Ruin Zone	$2A290	$2A476
83	3 adjoined platforms from Aquatic Ruin Zone	$2A4FC	$1021E
84	Pinball mode enable/disable (used in Casino Night Zone to determine when Sonic should stay in a ball)	$2115C	$1FFB8
85	Pressure spring from Casino Night Zone (Impulse spring?)	$2AB84	$2B07E $2B0EC
86	Flipper from Casino Night Zone	$2B140	$2B45A
87	Number of rings in Special Stage	$7356	$72D2
88	Tails' Tails in Special Stage	$34A5C	$34DA8
89	Aquatic Ruin Zone boss	$30480	$30E04
8A	Sonic Team Presents/Credits (leftover from S1)	$3EAC8	$3EB4E
8B	Cycling palette switcher from Wing Fortress Zone	$21392	$1FFB8
8C	Whisp (blowfly badnik) from Aquatic Ruin Zone	$36924	$36A4E
8D	Grounder in wall	$36A76	$36CF0
8E	Grounder badnik from Aquatic Ruin Zone	$36A76	$36CF0
8F	Wall behind which Grounder hides in Aquatic Ruin Zone	$36B88	$?????
90	Rocks thrown by Grounder behind wall in Aquatic Ruin Zone	$36BD4	$36CF0 $36D00 $36CFA
91	Chop Chop (piranha badnik) from Aquatic Ruin Zone	$36DAC	$36EF6
92	Spiker (drill badnik) from Hill Top Zone	$36F0E	$?????
93	Drill thrown by Spiker from Hill Top Zone	$36FE6	$37092
94	Rexon (lava snake badnik) from Hill Top Zone	$37322	$?????
95	Sol (fireball-throwing badnik) from Hill Top Zone	$370FE	$372E6
96	Rexon (lava snake badnik) from Hill Top Zone (again)	$37322	$?????
97	Rexon's head from Hill Top Zone	$373D0	$37678
98	Projectile with optional gravity (coconut, fireball, etc.)	$376E8	Too many to list
99	Nebula (bomber badnik) from Sky Chase Zone	$377C8	$3789A
9A	Turtloid (turtle badnik) from Sky Chase Zone	$37936	$?????
9B	Turtloid rider from Sky Chase Zone	$37A06	$?????
9C	Balkiry's jet from Sky Chase Zone	$37A82	$37B62
9D	Coconuts (monkey badnick) from Emerald Hill Zone	$37BFA	$37D96	$1E
9E	Crawlton (snake badnik) from Mystic Cave Zone	$37E16	$37FF2	$22
9F	Shellcraker (crab badnik) from Metropolis Zone	$3800C	$?????
A0	Shellcraker's claw from Metropolis Zone	$3815C	$38314
A1	Slicer (praying mantis badnik) from Metropolis Zone	$383B4	$?????
A2	Slicer's pincers from Metropolis Zone	$384A2	$385E2
A3	Flasher (firefly badnik) from Mystic Cave Zone	$3873E	$388F0
A4	Asteron (exploding star badnik) from Metropolis Zone	$3899C	$38A96
A5	Spiny (crawling badnik) from Chemical Plant Zone	$38AEA	$?????
A6	Spiny (on wall) from Chemical Plant Zone	$38B86	$38CCA
A7	Grabber (spider badnik) from Chemical Plant Zone	$38DBA	$3921A
A8	Grabber's legs from Chemical Plant Zone	$38F66	$3921A
A9	The little hanger box thing a Grabber's string comes out of	$39032	$3921A
AA	The thin white string a Grabber hangs from	$39066	$39228
AB	????????	$390A2	$?????	$00 - Unused Badnik #1 (All unused badniks are just garbled data) $01 - Invisible Unused Badnik $02 - Unused Badnik #2 $03 - Hurting effect below object $04 - ??? $06 - ??? $08 - Unused Badnik #3 $09 - Monitor effect when jumping under it, but crashes when jumping onto it $0A - Unused Badnik #4 $0B - Hurting Object $0C - Invisible Unused Badnik $0E - ??? $10 - Strange Hurting Object $12 - Unused Badnik #2 $14 - Strange hurtable object $15 - Object (jumped into) crashes game $16 - ??? $18 - Unused Badnik #5 $1A - ??? $1C - Strange hurtable object $1D - Invisible unused badnik $1E - Coconuts Badnik (not moving) $1F - Crashes upon approaching object $20 - Coconuts Badnik (hurtable) $21 - Unused Badnik (small square) $22 - Unused Badnik $24 - Unused Badnik #6 $26 - Strange Hurtable Object $27 - Invisible Unused Badnik $28 - Broken Spring Badnik??? $29 - Unused Badnik $2A - Hurtable Broken Spring Badnik $2C - Unused Badnik $2D - Invisible Unused Badnik $2E - Unused Badnik $2F - Invisible Hurtable Line?! $30 - Hurtable Object $32 - Unused Badnik $33 - Invisible line (crashes game) $34 - Hurtable Badnik $35 - Nasty crash when approaching object $36 - Unused Badnik $37 - Unused Badnik $38 - ??? $39 - Crashes when jumping into invisible object $3A - ??? $3C - ??? $3D - Invisible Unused Badnik $3E - Hurtable Badnik $3F - Crashes when jumping into invisible object $40 - Unused Badnik
AC	Balkiry (jet badnik) from Sky Chase Zone	$3937A	$393CC
AD	Clucker's base from Wing Fortress Zone	$3941C	$?????
AE	Clucker (chicken badnik) from Wing Fortress Zone	$39452	$395B4
AF	Silver Sonic	$3972C	$39E68 (Body, Flame) $3A08C (Eggman remote control window)
B0	??????? (Garbles graphics and crashes game after death)	$3A1DC	$?????
B1	Sonic on the SEGA screen	$3A3F8	$3A5A6
B2	The Tornado	$3A790	$3AFF2 $3B292
B3	Clouds (placeable object) from Sky Chase Zone	$3B2DE	$3B32C
B4	Vertical propeller from Wing Fortress Zone	$3B36A	$3B3BE
B5	Horizontal propeller from Wing Fortress Zone	$3B3FA	$3B548
B6	Tilting platform from Wing Fortress Zone	$3B5D0	$3B856
B7	Unused huge vertical laser from Wing Fortress Zone	$3B8A6	$3B8E4
B8	Wall turret from Wing Fortress Zone	$3B968	$3BA46
B9	Laser from Wing Fortress Zone that shoots down the Tornado	$3BABA	$3BB18
BA	Wheel from Wing Fortress Zone	$3BB4C	$3BB70
BB	????????	$3BB7C	$3BBA0
BC	Fire coming out of Robotnik's ship in Wing Fortress Zone	$3BBBC	$3BC08
BD	Ascending/descending metal platforms from Wing Fortress Zone	$3BC1C	$3BD3E
BE	Lateral cannon (temporary platform) from Wing Fortress Zone	$3BD7A	$3BE46
BF	Rotaty-stick badnik from Wing Fortress Zone	$3BEAA	$3BEE0
C0	Speed launcher from Wing Fortress Zone	$3BF04	$3C098
C1	Breakable plating from Wing Fortress Zone	$3C0AC	$3C280
C2	Wing Fortress Zone boss chamber entry switch	$3C328	$3C3C2
C3	Plane's smoke from Wing Fortress Zone	$3C3D6	$21120
C4	Plane's smoke from Wing Fortress Zone (again)	$3C3D6	$21120
C5	Wing Fortress Zone boss	$3C442	$3CCD8 $3CEBC
C6	Eggman	$3CED0	$3D0EE $3D1DE
C7	Eggrobo (final boss)	$3D4C8	$2D50A $3E318 $3E3D8 $3E438
C8	Crawl (badnik) from Casino Night Zone	$3D23E	$3D450
C9	"Palette changing handler" from title screen	$132F0	$136A8
CA	Movie sequence at end of game	$A1D6	$906E0 $906F8 $90722 $9073C (compressed)
CB	Background clouds from ending sequence	$A9F2	$?????
CC	Trigger for rescue plane and birds from ending sequence	$A3C8	$9076E $907C0 (compressed)
CD	Birds from ending sequence	$AAAE	$11E1C
CE	Sonic and Tails jumping off the plane from ending sequence	$A894	$?????
CF	"Plane's helixes" from ending sequence	$A988	$ADA2
D0	??? (removed)	$1637C	$?????
D1	??? (removed)	$1637C	$?????
D2	Flashing blocks in Casino Night Zone	$2B528	$2B694
D3	Bomb prize from Casino Night Zone	$2B84C	$2B8D4
D4	Big moving block from Casino Night Zone and Chemical Plant Zone	$2B8EC	$2B9CA
D5	Elevator from Casino Night Zone	$2BA08	$2BB40
D6	Cage that gives out points from Casino Night Zone	$2BB6C	$2BEBC
D7	Bumper from Casino Night Zone	$2C448	$2C626
D8	Coloured point block in Casino Night Zone	$2C6AC	$2C8C4
D9	Invisible hang flag from Wing Fortress Zone	$2C92C	$?????
DA	Continue text	$7A68	$7CB6
DB	Sprite of Sonic lying down from Continue screen	$7B82	$6FBE0
DC	Ring prize from Casino Night Zone	$125E6	$?????
N/A	Giant ring (leftover from S1, not listed in sprite table)	$12200	$123E6
N/A	Flash effect from giant ring (leftover from S1, not listed in sprite table)	$125E6	$124E6
N/A	Special bumpers in CNZ	$173BC	NA