Easy Final Boss
If you place the ship in the middle of the screen somwhere near the bottom you will not be hit by the blasts. If you stay in this safe zone the boss will die after about 20 seconds as you are not required to destroy it.

Unlock Full Power-Up:
During gameplay pause the game and press Up, Up, Down, Down, L, R, L, R, B, A.

Unlock 30 Extra Ships:
At the 'Title' screen hold L and press A, A, A, Start.

Unlock Arcade Mode:
At the 'Options' menu highlight the Game Level and rapidly tap the A Button until the level turns into Arcade mode.

Unlock Extra Credits:
Rapidly press 'X' at the 'Title' screen as many times as you can and press 'Start' before before the screen fades out.

Unlock Random Weapon Select:
Press Right on the D-pad to enter 'Edit' mode at the 'Weapon Select' screen and then press X, Y, X, X, Y, Y, X, Y.

Unlock System Reset:
Pause the game and press Up, Up, Down, Down, Left, Right, Left, Right, B, A, Start.

Suicide:
Hold L + R and the 'Start' button and then press 'Select'.

Pause game play and enter Up, Up, Down, Down, Left, Right, Left, Right, L, R. This code works on ALL the games in the collection on their easier settings and works once per level.