Boss Rush Mode - A, B, A, Select, Select, Select, Right, Up, Start. (At the start screen)

Invincibility (Japanese version) - Press B, B, Select, A, Up, Select, Right and Start before the title screen appears. If done right, the word MUTEKI will appear.

Stage 2 - A, B, A, A, A, Up, Down, B

Stage 3 - Select, A, B, B, A, Select, Down, Up

Stage 4 - Right, Right, Down, Down, Up, Up, B, Select, Select

Stage 5 - Down, Right, Left, B, A, B, Select, Select