yes, i know it's not an FMA game but the underlying fact is, "Ready, Steady, Go!" is used as the last stage of the game. if you have a DS, check it out. Americans may know the game as "Elite Beat Agents" which has a different set of songs. but if you want the game with the FMA theme song, get the japanese version.

I have a friend with that game too... man, Ready Steady Go stage is insane! I failed miserably at that...

Another game, Dai Gassou! Band Brothers (I own this) also has Melissa and Ready Steady Go in it.