Full Power-Up
Pause game play and press Up, Up, Down, Down, Left, Right, Left, Right, B, A, Start for missiles, items, and shields.

Note: This may only be done once per level.

Continue Game Play
Quickly press Down, Up, B, A, B, A, B, A, B, A after losing the last ship on Level 2 or higher.

Level Skip
Destroy the ship that appears at the end of each level within five seconds to skip the next level.