Teenage Mutant Ninja Turtles 2
aka: Teenage Mutant Hero Turtles 2
The Arcade Game

Full energy:
Pause game play and press Up, Down, Left, Right, A, B.

Two player mode:
Press Select + Start at the title screen.

Level Select:
Press D, D, D, D, D, R, R, R, R, R, R, R, B, A, ST For 1 Player Game, or
Press D, D, D, D, D, R, R, R, R, R, R, R, B, A, SL, ST For 2 Player Game.

Start with 19 Lives (Normally 2):
Press U, R, R, D, D, D, L, L, L, L, B, A, ST For 1 Player Game, or
Press U, R, R, D, D, D, L, L, L, L, B, A, SL, ST For 1 Player Game.

Level Select & 19 Lives:
Press B, A, B, A, U, D, B, A, L, R, B, A, ST For 1 Player Game, or
Press B, A, B, A, U, D, B, A, L, R, B, A, SL, ST For 2 Player Game.