During the game, type 1982GONZO. Then press the following key combinations simultaneously:
Code Result SHIFT+V Trace user SHIFT+X Teleports selected commandos CTRL+I Invincibility CTRL+SHIFT+N Finishes mission Shift+F1/F2/F3/F4 Video mode
Enter these Level codes on the Password screen:
Mission Code 2 4JJXB 3 ZDD1T 4 RFF1J 5 K4TCG 6 MIR4M 7 7QVJV 8 K99XC 9 924BF 10 JSGPW 11 CMODD 12 JGHD3 13 PUUWW 14 WT348 15 139P0 16 L9IPV 17 5LIMV 18 YJOJG 19 YFCWJ 20 GDKWT