From what I understand about this game, all of the art in this game is uncompressed. I have created a list of the locations needed for a basic art hack.
This compilation of art locations is nowhere near complete, but the locations listed will allow for a basic art hack of this game. All locations were based on a US Sonic Advance ROM. I'm not sure if the other versions will have the same locations.
Due to not knowing where the mappings for the levels are, level art edits have to be kept to the basic shape of the current art.
|Sega screen art||$000D655|
|Sonic's game play art||$0011E254|
|Tails' game play art:||$0018F614|
|Knuckles' game play art||$0021D374|
|Amy's game play art||$00296A34|
|Super Sonic art||$00316554|
|Coconuts Badnik art||$0031DE54|
|Buzz Bomber art||$0031F4D4|
|Weird Green Badnik||$00321294|
|Cloud / Explosion art||$00322E14|
|Weird Round Thing||$00329C14|
|Weird 3D object. Looks like a D&D 8 sided die||$00329D94|
|Another weird 3Dish object||$0032A394|
|Gun turret from Egg Rocket||$0032A894|
|Purple Sea Lion||$0032BA14|
|I dunno what this animal is||$0032C014|
|Deer/goat/four legged hoofed mammal||$0032C194|
|Bouncing wood block||$00332FF4|
|Bendy speed flags||$00334574|
|Fire? Water? Can't tell||$00336B74|
|Casino Night styled Triangle bumpers||$00338214|
|Balloons, the explosions, and bits left over||$00339954|
|Spinning bowl thing||$0033D7F4|
|Thing Sonic grabs and spins around/spinning elevator||$0033E6F4|
|Large light up letters that spell out SONIC and SEGA
(letter S is shared)
|Floating star drum||$00344CF4|
|Large moving block from the Casino Level||$00344F74|
|Rotating door from the casino level||$00345634|
|I dunno, it's stripy||$00346234|
|Hook from Secret Base||$00347ED4|
|I dunno. A platform?||$003481F4|
|Bouncing block from Secret Base||$003493F4|
|Unused(?) Chao sprites. looks to be gameplay styled||$00391074|
|Item Box(monitor) and contents||$003BFC54|
|Rings, sparkles, points, emeralds, HUD ring||$003C06D4|
|Sonic's character selection||$003C6274|
|Tails' character selection||$003C8A34|
|Knuckles' character selection||$003CBA94|
|Amy's character selection||$003CEF14|
|BG Art from the character selection||$003D33B4|
|Level Select "Zone,Act,Number" Art||$003E54B4|
|Level Select Icons||$003E9F34|
|Sparkles from ending sequence(?)||$003EB334|
|Gigantic Sonic art(showing his face)||$003EED34|
|Back view of the Tornado, followed by side view||$003F1D34|
|Eggman when you don't have all the emeralds in the credits||$003F4734|
|More level select icons||$003F86B4|
|Spin Dash Dust||$003F97F4|
|Normal Green Shield||$003FBC54|
|Invincibility Star thingie||$003FFB54|
|Emerald that falls into Eggman's hand in the intro||$0040E134|
|Unused Title Card Names(Forest Chao, or something)||$004620B4|
|Art for some gigantic wheel of some sort||$00486660|
|Neo Green Hill Act 1 Art||$004A7670|
|NGHZ Act 1 Animated Flowers||$004AF130|
|Neo Green Hill Act 2 Art||$004BF418|
|NGHZ Act 2 Animated Flowers||$004C6ED8|
|Secret Base Act 1 Art||$004D66D0|
|Secret Base Act 2 Art||$004EF514|
|Casino Level Art (Acts 1 and 2 use same art)||$00507188|
|Ice Mountain Act 1 Art||$0053D93C|
|Ice Mountain Act 2 Art||$0055B370|
|Angel Island Act 1 Art||$00578028|
|Angel Island Act 2 Art||$005952E8|
|Egg Rocket Art||$005B1E40|
|Cosmic Angel Art||$005D0210|
|X Zone Art||$005EA710|
|Moon Zone Art||$005F2158|
|Neo Green Hill Background||$0062D274|
|Secret Base Background||$0062F490|
|Casino Paradise Background||$006318AC|
|Ice Mountain Background||$006332C8|
|Angel Island Background||$006382E4|
|Egg Rocket Backgrounds||$0063ABD0|
|Cosmic Angel Background||$00641BCC|
|X Zone Background||$00645268|
|Moon Zone Background||$0064A92C|
|Then after that, the "unused" level BGs|
that are only accessible by cheating
|Title Cards in the following order: Son,Tai,Knu,Amy||$0065A538|
|Title Cards For the level names||$00660558|
|16x16 mappings||I don't think they exist, as 96x96 mappings are made up by individual 8x8 tiles.|
|Object positions||Haven't found them yet.|
The palette is easy to edit. 2 bytes for every color entry. These bytes are in little endian format, meaning the bytes are swapped. For example, 7FFF(which is white) would = FF7F. Sonic Advance Pal Tool is excellent for finding out the color coding for your appropriate color.
The foreground art is uncompressed, meaning you can open it in any tile editor that supports GBA 4BPP, or 4 bits per pixel. 8BPP is optional, if you want to edit the Title Screen art.
I'm not exactly sure how this works. But this is uncompressed. Anyways, since nobody knows how it works yet, or what the collision definitions are, editing this will be a bitch.
Sonic Advance is strange compared to the Gen/MD Sonic games in that it uses 96x96 metablocks, instead of the 256x256 or 128x128 in Sonic 1 or Sonic 2. The 96x96 mappings are built up from 8x8 tiles, and not 16x16 as in the Gen/MD Sonic games. Each definition of an 8x8 tile is 2 bytes in little endian format(swapped). For example, if you wanted the right petal of the animated flower, it would be 0100, instead of 0001. I'm not sure how palette switching/flip/mirroring works yet.
The level layout is extremely similar to Sonic 1, where the layout goes horizontally until it ends that row, then starts the next row. The difference between Sonic 1 is that it doesn't appear to have a 'limit' on the tiles for each row, that I can find at least. The layout starts off with BG 1(as labeled in VBA), then goes to BG 2, which I call the scenery layer. This layer isn't solid at all. Then it comes to BG 3, which I call the solid layer, as every collision here is, well, solid. Well, here's a tile list. If the list does not interest you, click on the image next to this section.
Offset $4BF1B0-4BF1B4 appears to load the 96x96 mappings. Offset $4BF1B4-4BF1C0 appears to be coding regarding animated art. A few bytes control which tiles are loaded, and a few control the speed of the animations.
Start of Solid Layer in NGHZ 1(that's where you start at least): 004BEB68
Title screen art Part 1: $BF948-C7C88 - This is a bitch. The title screen takes advantage of a 256 color palette, meaning that editing this in TLP will be extremely difficult. To effectively edit this, open up Visual Boy Advance's palette viewer, count to the color you want(horizontally and in hex values) and type that byte in. 1 byte is one pixel. Also, the title screen does bother with mappings, so that could get in your way. Or, if you want the easy way, download TilEd 2002, or something similar.
In my effort to find objects, and possibly start locations for Sonic/characters, I've looked into memory.
Around $A00 in WRAM, things change when you jump.
Around $2510 in WRAM, things change when you bring up the insta-shield
Around $2580 in WRAM, things change for jumping as well as somersaulting.
Sonic's X location?(!): $03000408 (IRAM)
Sonic's Y location?(!): $03000418 (IRAM)
General object RAM, starts around $ 03001B30, in IRAM. Use to find obj positions.
currently: Sonicxy: 0025 0054
Note: I did a search for start positions based off of the ram variables. I found nothing in the rom.
This 'guide' is no guide at all. In fact, it's barely got any info in it. If you'd like to hunt for other level specific info, such as layouts for another layout, locate the foreground art for that level/act, and after that, the data should be there in the following order: foreground art, collision, 96x96 mappings, and the level layout. After level layout, some stuff regarding animated patterns may be present.
|Sonic Community Hacking Guide|
|Sonic Music Hacking Guide | SonED2 Manual|
|Sonic the Hedgehog (16-bit) | Sonic the Hedgehog (8-bit) | Sonic Eraser | Sonic CD (prototype 510) | Sonic CD | Sonic CD (PC) | Sonic CD (2011) | Sonic 2 (Nick Arcade prototype) | Sonic 2 (Simon Wai prototype) | Sonic 2 (16-bit) | Sonic 2 (8-bit) | Sonic 2 & Knuckles | Dr. Robotnik's Mean Bean Machine | Sonic Triple Trouble | Sonic 3 | Sonic & Knuckles | Sonic 3 & Knuckles | Sonic & Knuckles Collection | Sonic Crackers | Sonic 3D: Flickies' Island | Chaotix | Sonic R PC | Sonic Jam 6 | Sonic Advance | Sonic Advance 2 | Sonic Advance 3 | Sonic Battle | Sonic Adventure | Sonic Adventure DX: Director's Cut | Sonic Adventure DX: PC | Sonic Adventure (2010) | Sonic Adventure 2 | Sonic Adventure 2: Battle | Sonic Adventure 2 (PC) | Sonic Heroes | Shadow the Hedgehog | Sonic Riders | Sonic the Hedgehog (2006) | Sonic & Sega All-Stars Racing | Sonic Unleashed (Xbox 360/PS3) | Sonic Colours | Sonic Generations | Sonic Lost World | Sonic Forces|
|The Nemesis Hacking Guides||The Esrael Hacking Guides|
|ROM: Sonic 1 | Sonic 2 | Sonic 2 Beta | Sonic 3||Sonic 1 (English / Portuguese) | Sonic 2 Beta (English / Portuguese) | Sonic 2 and Knuckles (English / Portuguese)|
|Move to Sega Retro|
|Number Systems (or scrap) | Assembly Hacking Guide | Subroutine Equivalency List | 68000 Instruction Set | 68000 ASM-to-Hex Code Reference | VDP Documentation | Official Sega 32X Documentation | Official Mega-CD Documentation | Official Sega Mega Drive Documentation|