Gradius 5 cheats and cheat codes for Playstation 2

Add Extra credits 
Add +1 credit per each hour on game play 

Unlock Free play 
Reach minimum 18 hours game play 
Game play does not count when you  wait on the demo or title screens.

Checking your game play hours on the Load/Save menu.
It saves your game play hour when:
1.) You game over.
2.) You made a software reset.
3.) You jump to the Pause Menu and exit to the title.

Full power up
Press Start to the Pause Menu and then enter the code.
Full power up cheat is cumulative. After you use one, it deducts from the total.

For example:
At the beginning (stage 1), you have only 1 full power up cheat. 
At stage 3, if you never use it, you have 3 full power up cheats.
At stage 5, you have 5 full power up cheats, etc.

Instant 2x shot power-up:
Up, up, down, down, left, right, left, right, L2, R2 
You can use maximum 25 times.

Instant laser shot power-up:
Up, up, down, down, left, right, left, right, L1, R1 
You can use maximum 25 times.

Weapon edit mode:
Finish the entire game once. Go to the weapon selection screen and press R1 
to enter the edit mode. Push L1 to go back to selection menu.