Gradius 3 And 4 - Mythology Of Revival cheats and cheat codes for Playstation 2

Full double shot power-up:
While playing the game press pause, after press
Up, Up, Down, Down, Left, Right, Left, Right, Square, Triangle.
The sound will confirm, if the entered code is accepted.
Note: You can use this cheat only a few times.

Full laser shot power-up:
Pause the gameplay, after press
Up, Up, Down, Down, Left, Right, Left, Right, X, Circle.
The sound will confirm, if the entered code is accepted.
Note: You can use this cheat only a few times.
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Unlock cube attack in Gradius 3 extra mode:
Reach level 9 in the game

Unlock 1st Gradius stage in Gradius 3 extra mode:
Reach level 10 and get a bullet hit from Boss weapon

Unlock Extra edit option in Gradius 3:
Finish the game or reach 10 hours of game play in Gradius 3.
You can edit the weapon combinations in this option.

Unlock Boss rush mode in Gradius 4:
Finis the entire game once

Unlock level selection option in Gradius 4:
Finish the entire game once, without using a single continues