99 Submarines - When you run out of submarines, press Start and perform the ''Level Skip'' code.

Control Scrolling - During gameplay, pause and press Up, Up, Down, Down, Left, Left, Right, Right

Double Scoring - During gameplay, pause and press A, B, B, A, Right, Down, Up, Left, Left

Full Systems Code - During gameplay, pause the game and press A, B, Select, A, B, Select, A, B, Select, A, B, Select, A, B, Select, A, B, B, A

Level Skip - During Gameplay, pause the game, and press A, B, Select, Right, Left, Left, Right, Select, B, A, B, B, A

No Inertia - During gameplay, pause then press Up, Down, Left, Right, Select