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This is the Sonic Community Hacking Guide for the Mega Drive version of Sonic 3D: Flickies' Island.
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
|
Compression
|
| $0
|
4 bytes
|
Pointer
|
Object placement
|
RNC
|
| $4
|
4 bytes
|
Pointer
|
Collision layout
|
RNC
|
| $8
|
4 bytes
|
Pointer
|
Graphics for plane B tiles
|
RNC
|
| $C
|
4 bytes
|
Pointer
|
Graphics for plane A tiles
|
N/A
|
| $10
|
4 bytes
|
Pointer
|
32x32 mappings for plane B
|
N/A
|
| $14
|
4 bytes
|
Pointer
|
32x32 mappings for plane A
|
N/A
|
| $18
|
4 bytes
|
Pointer
|
Level layout
|
N/A
|
| $1C
|
4 bytes
|
Pointer
|
List of miscellaneous graphics to load
|
Custom, graphics use RNC
|
| $20
|
4 bytes
|
Pointer
|
Start position, checkpoint positions, etc.
|
N/A
|
| $24
|
2 bytes
|
N/A
|
Unused? (always $0000)
|
N/A
|
| $26
|
1 byte
|
Index
|
1st palette
|
None
|
| $27
|
1 byte
|
Index
|
2nd palette
|
None
|
| $28
|
1 byte
|
Index
|
3rd palette
|
None
|
| $29
|
1 byte
|
Index
|
4th palette
|
None
|
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
|
Eggman Hitcount locations
| Offset
|
Description
|
| $DDBB
|
Green Grove Zone
|
| $6DD5
|
Rusty Ruins
|
| $8851
|
Spring Stadium Zone
|
| $F265
|
Diamond Dust Zone
|
| $9E65
|
Volcano Valley Zone
|
| $11113
|
Gene Gadget Zone
|
| $125ED
|
Panic Puppet Zone Right Arm Part 1?
|
| $13097
|
Panic Puppet Zone Right Arm Part 2?
|
