Damizean

I think it was included before the build 111, when the Background System Box bug was fixed :3

Pack of stuff. There is a keydata follow example there, wich is the method used in the Sonic games (create an array with all the keydata the player pressed and then, use a delayed one for Tails). That way you can make your actions in the same ways for the two players, only having to use a different keydata.

This layer extension is supossed to be included in the MMF packages, on later builds

Yeah, inheritance and polyphormism rules. It's a shame it's not preferable to use C++ in low-end machines, though. Generates a lot of garbage code :3

It's C, a high level programming language, it has nothing to do with MMF or GM (though some GM syntax rules are based on C99 standard)