SCHG:Sonic 3D: Flickies' Island
From Sonic Retro
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This is the Sonic Community Hacking Guide for the Mega Drive version of Sonic 3D: Flickies' Island.
Level headers
Level headers are 42 bytes each. They contain data needed to load their layout, objects, etc. Below is the format for a level header. N/A means that we yet don't know its functionality, however looking at their values it seems like them all are pointers. If a question mark (?) is in the description, then the content isn't confirmed yet. All palettes pointers are indices from some array.
| Offset | Size | Type | Description |
|---|---|---|---|
| $0 | 4 bytes | Pointer | Object Placement , Compressed? |
| $4 | 4 bytes | Pointer | Collision Level Layout / Sonic Start Position (?) |
| $8 | 4 bytes | Pointer | B Plane Mappings. |
| $C | 4 bytes | Pointer | Graphics. |
| $10 | 4 bytes | Pointer | A Plane Mappings. |
| $14 | 4 bytes | Pointer | N/A |
| $18 | 4 bytes | Pointer | Graphical Level Layout (?) |
| $1C | 4 bytes | Pointer | N/A |
| $20 | 4 bytes | Pointer | Collision Level Layout / Sonic Start Position (?) |
| $24 | 2 bytes | N/A | Unused? (always $0000) |
| $26 | 1 byte | Index | 1st palette |
| $27 | 1 byte | Index | 2nd palette |
| $28 | 1 byte | Index | 3rd palette |
| $29 | 1 byte | Index | 4th palette |
Level headers locations
Those are the addresses for the headers of all the levels in the game. They point to the beginning of the header data, of course.
| Offset | Description |
|---|---|
| $1AB62 | Green Grove Zone Act 1 |
| $1AB8C | Green Grove Zone Act 2 |
| $1ABB6 | Green Grove Zone Act 3 |
| $1AC5E | Rusty Ruin Zone Act 1 |
| $1AC34 | Rusty Ruin Zone Act 2 |
| $1AC88 | Rusty Ruin Zone Act 3 |
| $1ADAE | Spring Stadium Zone Act 1 |
| $1ADD8 | Spring Stadium Zone Act 2 |
| $1AE02 | Spring Stadium Zone Act 3 |
| $1ACB2 | Diamond Dust Zone Act 1 |
| $1ACDC | Diamond Dust Zone Act 2 |
| $1AD06 | Diamond Dust Zone Act 3 |
| $1AD5A | Volcano Valley Zone Act 1 |
| $1AD30 | Volcano Valley Zone Act 2 |
| $1AD84 | Volcano Valley Zone Act 3 |
| $1ABE0 | Gene Gadget Zone Act 1 |
| $1AC0A | Gene Gadget Zone Act 2 |
| $1AE2C | Gene Gadget Zone Act 3 |
| $1AE80 | Panic Puppet Zone Act 1 |
| $1AE56 | Panic Puppet Zone Act 2 |
| $1AEAA | Panic Puppet Zone Act 3 |
| $1AED4 | The Final Fight |
