Level select: Press Up two times, Down two times, Right,
Left, Right, Left, 1 at the title
screen.
Sound test: Press Down two times, Up two times, Left,
Right, Left, Right, 1 at the title
screen.
Invincibility: Select Sonic and press Up + [Jump] continously,
then hold Up while in a jump. If done correctly, Sonic
will glitter and be invincible until he stops running fast.
