DOOM cheat codes
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While playing:

All Weapons, All Keys, & Full Life: Pause and #
GOD mode: Pause and *
Jump to Level 1: Pause and 1
Jump to Level 2: Pause and 2
Jump to Level 3: Pause and 3
Jump to Level 4: Pause and 4
Jump to Level 5: Pause and 5
Jump to Level 6: Pause and 6
Jump to Level 7: Pause and 7
Jump to Level 8: Pause and 8
Jump to Level 9: Pause and 9
Jump to Level 10: Pause and A
Jump to Level 20: Pause and B