ASM Sonic the Fighters - Disassembly (and discoveries from it)

The unused ice cubes have been restored with an unreferenced routine that sets up the stage!



The above is the area of data that sets up Aurora Icefield. The first "2" represents how many sets of setup routines should be processed for the stage.


But as we can see `aurora_nothing` (not an official label) just returns. But the code under that is unreferenced. By moving the pointer in the setup to offset 0x7561C instead of 0x75618, the routine which draws the ice cubes on the stage will properly activate!

 

Been a while, eh?



Recently discovered that the stage background music select routine has an oversight.

If Sonic is Player 1 and Knuckles is Player 2 (multiplayer), North Wind will play. The first check in this routine is if Sonic is player 1. If Player 1 isn't Sonic, it jumps down and checks... if Player 1 is Sonic and if Player 2 is Knuckles.... wait what?

In many instances where two players are checked against eachother, the check is always "fa_rob0" vs "fa_rob1" followed by the opposite check of "fa_rob1" vs "fa_rob0". In this case, values g7 and g8 in the lodb checks need to be swapped at 3F644 and 3F64C.

This is a very simple fix to allow North Wind to be play even if Knuckles is Player 1 and Sonic is Player 2.

 

I actually addressed this in the really old "Sonic Fighters Hacking" thread. At the time I thought this indicated another stage for mechless Eggman, but I think it's just an oversight and North Wind was just inserted and it bumped Hurry Up out of the playable list.