Features menu
Enter "?TJL BDFW BFGV JVVB" as a password. The game will begin on level one. Pause game play to access a new "Features" menu that allows level selection, invulnerability, map mode, health boost, and weapons/ammunition. You can also access the "warp to fun" levels 25, 26, and 27. Once enabled, the health boost and weapons/ammunition options may not be disabled. The invulnerability option will be disabled on level 32. Once enabled, the features menu will appear when any saved game is paused until the Nintendo 64 is powered off or reset.

Skill Level: Be gentle!
Level Password
2 cdp8 9bj2 68zt svk?
3 cxm8 9bjy 681t jvk?
4 ddk8 9bjt 683s 9vk?
5 dxh8 9bjp 685s 1vk?
6 fdf8 9bjk 687s svk?
7 fxc8 9bjf 689s jvk?
8 gd?8 9bc? 69br ?bk?
9 gx88 9bc6 69dr 2bk?
10 hd68 9bc2 69gr tbk?
11 hx48 9bcy 69jr kbk?
12 jd28 9bct 69lq ?bk?
13 jx08 9bcp 69nq 2bk?
14 kdy8 9bck 69qq tbk?
15 kxw8 9bcf 69sq kbk?
16 lft8 9bb? 69vp ?vk?
17 lyr8 9bb6 69xp 2vk?
18 mfp8 9bb2 69zp tvk?
19 mym8 9bby 691p kvk?
20 nfk8 9bbt 693n ?vk?
21 nyh8 9bbp 695n 2vk?
22 pff8 9bbk 697n tvk?
23 pyc8 9bbf 699n kvk?
24 qf?8 9bf? 6?bm ?bk?
25 qy88 9bf6 6?dm 2bk?
26 rf68 9bf2 6?gm tbk?
27 ry48 9bfy 6?jm kbk?
28 sf28 9bft 6?ll ?bk?
29 sy08 9bfp 6?nl 2bk?
30 tfy8 9bfk 6?ql tbk?
31 tyw8 9bff 6?sl kbk?
32 vbt8 9bd? 6?vk 9vk?

Skill Level: Bring it on!

Level Password
2 cjpr 9bj1 68z? qvk?
3 c1mr 9bjx 681? gvk?
4 djkr 9bjs 6839 7vk?
5 d1hr 9bjn 6859 zvk?
6 fjfr 9bjj 6879 qvk?
7 f1cr 9bjd 6899 gvk?
8 gj?r 9bc9 69b8 8bk?
9 g18r 9bc5 69d8 0bk?
10 hj6r 9bc1 69g8 rbk?
11 h14r 9bcx 69j8 hbk?
12 jj2r 9bcs 69l7 8bk?
13 j10r 9bcn 69n7 0bk?
14 kjyr 9bcj 69q7 rbk?
15 k1wr 9bcd 69s7 hbk?
16 lktr 9bb9 69v6 8vk?
17 l2rr 9bb5 69x6 0vk?
18 mkpr 9bb1 69z6 rvk?
19 m2mr 9bbx 6916 hvk?
20 nkkr 9bbs 6935 8vk?
21 n2hr 9bbn 6955 0vk?
22 pkfr 9bbj 6975 rvk?
23 p2cr 9bbd 6995 hvk?
24 qk?r 9bf9 6?b4 8bk?
25 q28r 9bf5 6?d4 0bk?
26 rk6r 9bf1 6?g4 rbk?
27 r24r 9bfx 6?j4 hbk?
28 sk2r 9bfs 6?l3 8bk?
29 s20r 9bfn 6?n3 0bk?
30 tkyr 9bfj 6?q3 rbk?
31 t2wr 9bfd 6?s3 hbk?
32 vgtr 9bd9 6?v2 7vk?

Skill Level: I own Doom!

Level Password
2 cnn8 9bj0 680t nvk?
3 c5l8 9bjw 682t dvk?
4 dnj8 9bjr 684s 5vk?
5 d5g8 9bjm 686s xvk?
6 fnd8 9bjh 688s nvk?
7 f5b8 9bjc 68?s dvk?
8 gn98 9bc8 69cr 6bk?
9 g578 9bc4 69fr ybk?
10 hn58 9bc0 69hr pbk?
11 h538 9bcw 69kr fbk?
12 jn18 9bcr 69mq 6bk?
13 j5z8 9bcm 69pq ybk?
14 knx8 9bch 69rq pbk?
15 k5v8 9bcc 69tq fbk?
16 lps8 9bb8 69wp 6vk?
17 l6q8 9bb4 69yp yvk?
18 mpn8 9bb0 690p pvk?
19 m6l8 9bbw 692p fvk?
20 npj8 9bbr 694n 6vk?
21 n6g8 9bbm 696n yvk?
22 ppd8 9bbh 698n pvk?
23 p6b8 9bbc 69?n fvk?
24 qp98 9bf8 6?cm 6bk?
25 q678 9bf4 6?fm ybk?
26 rp58 9bf0 6?hm pbk?
27 r638 9bfw 6?km fbk?
28 sp18 9bfr 6?ml 6bk?
29 s6z8 9bfm 6?pl ybk?
30 tpx8 9bfh 6?rl pbk?
31 t6v8 9bfc 6?tl fbk?
32 vls8 9bd8 6?wk 5vk?

Skill Level: Watch me die!

Level Password
2 csnr 9bjz 680? lvk?
3 c9lr 9bjv 682? bvk?
4 dsjr 9bjq 6849 3vk?
5 d9gr 9bjl 6869 vvk?
6 fsdr 9bjg 6889 lvk?
7 f9br 9bjb 68?9 bvk?
8 gs9r 9bc7 69c8 4bk?
9 g97r 9bc3 69f8 wbk?
10 hs5r 9bcz 69h8 mbk?
11 h93r 9bcv 69k8 cbk?
12 js1r 9bcq 69m7 4bk?
13 j9zr 9bcl 69p7 wbk?
14 ksxr 9bcg 69r7 mbk?
15 k9vr 9bcb 69t7 cbk?
16 ltsr 9bb7 69w6 4vk?
17 l?qr 9bb3 69y6 wvk?
18 mtnr 9bbz 6906 mvk?
19 m?lr 9bbv 6926 cvk?
20 ntjr 9bbq 6945 4vk?
21 n?gr 9bbl 6965 wvk?
22 ptdr 9bbg 6985 mvk?
23 p?br 9bbb 69?5 cvk?
24 qt9r 9bf7 6?c4 4bk?
25 q?7r 9bf3 6?f4 wbk?
26 rt5r 9bfz 6?h4 mbk?
27 r?3r 9bfv 6?k4 cbk?
28 st1r 9bfq 6?m3 4bk?
29 s?zr 9bfl 6?p3 wbk?
30 ttxr 9bfg 6?r3 mbk?
31 t?vr 9bfb 6?t3 cbk?
32 vqsr 9bd7 6?w2 3vk?

Secret levels for special keys
Level 4 has a secret entrance to level 29.
Level 12 has a secret entrance to level 30.
Level 18 has a secret entrance to level 31.
Destroy all the barrels on Level 1 to access Level 32. The warp is in a secret room behind the starting location of the level. Save the first barrel to be destroyed last.

Death messages
Do not immediately resume game play after losing a life. Random messages will appear at the top of the screen for several seconds at one minute intervals.

Super status
Enter "W93M 7H20 BCY0 PSVB" as a password. The game will begin on the last level with 100 health, 200 armor, all weapons, full ammunitions, the backpack, and levels 29 to 31 completed. The inventory will contain three pentagram items that power-up the laser to be three times as powerful as the BFG9000 and activate the three switches in the last level to close the gates that spawn the monsters.