Chopper Attack

Note: This game another title is Wild Choppers.

Enable debug mode - stage selection and other options:
Hold Z and hit Right, Left, Up, Down, A, B, Start at the title screen,
where the "Push Start Button" text is flashing.

Stage select
Hit C-Up(7 times) at the title screen, where the "Push Start Button"
text is flashing.

President jump out from plane:
During game play, hit Z + C-Up + C-Down, then launch a homing cluster
at your opponent.

Stingray
Find Stingray in stage 7, beat him, after finish the mission.

King 10
Find King 10 in stage 7, beat him, after finish the mission.

Alien plasma weapon
Finish stage 7 in expert mode. After, fight on the moon to buy
the alien weapon.

Select power chopper
Hold L + R + Z and hit Start at the main menu, before choose a chopper.