A, to select, C to go back, Z to jump. Arrow keys to move and if you're tails, Double click Z to fly. If you're Sonic, Double click Z to Double Jump. If you're Sonic and Tails, Triple click Z to be carried by Tails. and Double click z to double jump.
v0.93 here: https://scratch.mit.edu/projects/1378554416/ Credits to @The_Updator for the previous version. Credits to tomicool for the engine. Credits to me for remade menu scripts.