Unlock all weapons and power-ups:
While playing under the easier difficulty level, pause the game, then
press Up, Up, Down, - Down, Left, Right, Left, Right, L, R.
Unlock all weapons and power-ups in the Japanese version of the game:
While playing under the easier difficulty level, pause the game, then
press Up, Up, Down, Down, Left, Right, Left, Right, X, Circle.
Gradius 3:
Unlock Cube Attack: Survive until level 9.
Unlock Gradius level: Intentionally get shot by the Final Boss.
Unlock Salamander level: Intentionally get shot by the Final Boss.
Unlock Stage Select option: Finish the game.
Unlock Extra Mode: Survive until level 9.
Unlock Extra Edit: Finish the game. Select Extra Mode to access more weapons.
Gradius 4:
Unlock Boss Rush mode and Stage select option:
Finish the game once.
Gradius Gaiden:
Unlock Stage select option:
Finish the game on normal or higher difficulty level.
Latest cheat codes for Gradius Collection at Cheatserver.com
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