Get Auto Reload:
Put in the code OTOREL. A sound will signal correct code entry

Get All Weapons:
Put in the code HUIBON. A sound will signal correct code entry

Get Healed:
Put in the code VONLUX. A sound will signal correct code entry

Get Boxed Computer:
Put in the code COMMANDO. A sound will signal correct code entry

Level Codes:
Level Easy Normal Hard
Roman YPTERFGZ QJSLVABL SOIOLGNK
Japan NKTOLVIF KAYAGEAF TFJSVJMC
Middle Age VMXYICCB MZFSPQDD XFYAMXIE
Conquistadors FDQLUGGC AVMJFGGU ZOVASAIV
Wild West ZREHQFIR EVBSVTCV BODSGWLW
Modern Wars FBTAWPFC YLHHGXBO VEJHMQKO
Future EFBYQHME ALPYPJFO ZEYPCEHQ
Beyond Time CWFLWYHC YBULVABN HMFDLGNN