Level Select
Press B, A, Left, Right, B, A, Start at the title screen.

Invincibility
Press Up on controllers one and two. Enter KJTTJK as a password. Alternatively, press Up + A + B on controllers one and two to display the password screen.

Full Weapons
Press Up on controllers one and two. Enter CKWJT4 as a password. Alternatively, press Up + A + B on controllers one and two to display the password screen.

Two Extra Continues
Press Up on controllers one and two. Enter J8SCL9 as a password. Alternatively, press Up + A + B on controllers one and two to display the password screen.

Infinite Continues
Press Up on controllers one and two. Alternatively, press Up + A + B on controllers one and two to display the password screen.

Expert Mode
Press Up on controllers one and two. Enter KCHDR4 as a password. Alternatively, press Up + A + B on controllers one and two to display the password screen.

Possessor 1
Press Up on controllers one and two. Enter FPNFR7 as a password. Alternatively, press Up + A + B on controllers one and two to display the password screen.
Possessor 2
Press Up on controllers one and two. Enter 9KY3FG as a password. Alternatively, press Up + A + B on controllers one and two to display the password screen.
Level Skip
Press Up on controllers one and two. Enter GDXK4F as a password. Alternatively, press Up + A + B on controllers one and two to display the password screen.