Infinite Shields and Weapons:
Enter 'alexander' as a password.

Level select:
Enter Commander*Jeffer as a password.

Unlimited primary weapon power:
Enter Tranquillex as a password.

Unlimited secondary weapons:
Enter Memo*X33RTY as a password.

Unlimited shields:
Enter Hestas*Retort as a password.

Disable all cheats:
Enter All*cheats*off as a password.