SCHG:Sonic the Hedgehog 3 & Knuckles
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Note: As S3&K is a "lock-on" game, all offsets below $200000 are in the base S&K ROM, and all offsets above $200000 are in the connected S3 ROM.
Contents
ROM Hacking
Art Editing
Uncompressed Art Locations
Nemesis Compressed Art Locations
Kosinski Compressed Art Locations
Palette Editing
Insert table of palette locs here
For information about the palette format, see Megadrive palette.
Pattern Load Cues
Object Editing
Object Pointer List
Sprite Mappings
Object Placement
There are six bites in one object definition. The first two bytes are the X position of the object, and the next two bytes are the Y position. The 5th byte is the reference number on the object pointer list (see above), and the 6th byte is an optional declaration to use for defining that object's behavior and/or animation. This will depend on the object. See the level specific hacking info for the locations of the object lists.
The 6th byte, the object subtype, is loaded in the 28th byte of the SST of that object (see below).
Ring Placement
There are four bytes for every ring object. The first 2 bytes are X coordinates, after that there is one nibble to determine how many rings, then three nibbles (or one nibble and one byte) for the Y coordinates. After you are done adding all your rings for the level, "FF FF" will end the ring data. A format would look like this:
XX XX TY YY
Where X represents X position, Y represents Y position, and T represents type, as per the table below.
Example: 03 46 10 2B
If you see this, then you will get two horizontal rings at X = 0346 Y = 02B. The "1" determines how many rings there are, and what direction they go. (horizontal or vertical) Here is what you get for each value:
| Value | Rings |
|---|---|
| 0 | 1 Horizontal |
| 1 | 2 Horizontal |
| 2 | 3 Horizontal |
| 3 | 4 Horizontal |
| 4 | 5 Horizontal |
| 5 | 6 Horizontal |
| 6 | 7 Horizontal |
| 7 | 8 Horizontal |
| 8 | 1 Vertical |
| 9 | 2 Vertical |
| A | 3 Vertical |
| B | 4 Vertical |
| C | 5 Vertical |
| D | 6 Vertical |
| E | 7 Vertical |
| F | 8 Vertical |
Level Layout
Level layouts are compressed in Kosinski format, so to edit them you will need to decompress them first. (I recommend using TSDC for this)
Level layouts are pretty simple. There is one bye per 128x128 tile to place on the map. The blocks are put together from left to right, top to bottom. Each horizontal row is 60 bytes long. 60 bytes for the first row of the foreground, then 60 bytes for the first row of the background, then 60 bytes for the second row of the foreground....(it continues like this).
See the level specific hacking info for the locations of level layout data. (Put here for now, will eventually be moved to subpage)
| Offset | Level Name |
|---|---|
| 2814A8 | Angel Island 1 |
| 281CF4 | Angel Island 2 |
| 282A5A | Hydrocity 1 |
| 283582 | Hydrocity 2 |
| 28442A | Marble Garden 1 |
| 2850BA | Marble Garden 2 |
| 285E6A | Carnival Night 1 |
| 286A34 | Carnival Night 2 |
| 2879C2 | Icecap 1 |
| 28898A | Icecap 2 |
| 2897DA | Launch Base 1 |
| 28A786 | Launch Base 2 |
| 09F43E | Mushroom Hill 1 |
| 0A0172 | Mushroom Hill 2 |
| 09D708 | Flying Battery 1 |
| 09D708 | Flying Battery 2 |
| 0A0DE2 | Sandopolis 1 |
| 0A1C4E | Sandopolis 2 |
| 0A2A66 | Lava Reef 1 |
| 0A388E | Lava Reef 2 |
| 0A76F4 | Lava Reef 2 (Robotnik) |
| 0A79AC | Hidden Palace |
| 0A4616 | Sky Sanctuary 1 |
| 0A5286 | Sky Sanctuary 2 |
| 0A5402 | Death Egg 1 |
| 0A63D0 | Death Egg 2 |
| 0A7FD4 | Death Egg 2 (Robotnik) |
| 0A725E | Doomsday |