Type these cheats during gameplay:
COMEANDHAVEAGO: Get all weapons.
IFYOUTHINKYOUAREHARDENOUGH: Unlimited ammo for all weapons.
NADIAPOPOV##: Warp to level ##.
At the Options screen, go to Password
and type these level codes:
TQBBBBBB13BB94B2 KLBTLBLMBZJG9BBB: Level 211.
YQBJVBBBF7BB94BB QVBLNBBMB7QK9BBB: Level 311.