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To enter a code you must first begin a level, then pause the game with Start button. Push and hold L button and R button, then input one of the following button sequences, then release.

Effect Button Sequence
Restore Health B buttonB buttonX buttonX button
Perfect Mode X buttonDown controlY buttonA button
Always Devastating Y buttonUp controlY buttonDown control
All Upgrades Up controlDown controlY buttonB button
Infinite Missiles B buttonB buttonDown controlX button
Invulnerable B buttonX buttonB buttonUp control
Targeting Indicator Mode Down controlX buttonUp controlB button