Here is Knuckles fighting upside-down in the air, alone, for your enjoyment...

Now I kind of want to remove "no gravity" and have only "gravity on" for everything...

The cutscenes as well as the character select screen also appear to disable gravity for the player characters 🤯

Actually I think I might have been thinking too hard about this and NO GRAVITY is called more than USE GRAVITY. Basically most player animations disable gravity because they are programmed to end up moving a specific direction.

Actually, looking at it, gravity might turn off for a player when they have ring-out, when the player is hit over the fence...

The routine is at 0x1815C, but it's also within the normal gravity routine. The conditionals for "no gravity" are met at offsets 0x180D4, 0x18114 and 0x18118. As far as I can tell, the flag that would set this condition to be true (0) happens at 0x185B4.

I can't pinpoint where it does get used, sadly, but I do see the routine is called. It's a condition if the game should use "normal gravity" or "no gravity". I don't know when exactly it shuts it off.

The emulator does patch the arcade ROM, but this means you need to know what to patch in order to modify the recomp to create the changes you want. So any changes would first need to be made to the ROM, then added as a patch in the recomp.

I love a good @sonicthefighte.rs reference

And here is the rng changed to always return 0!