Sonic 3D: Flickies' Island/Technical information

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Mega Drive version

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	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

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

Eggman hit count 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?

Sonic 3D FMV Player

S3DPlay - Developed by sasuke, this is a proof of concept program to demonstrate how the Mega Drive version of Flickies' Island generates video during the opening sequence.