DOOM -- DOS
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Codes-
Type in these codes during play to get special abilities
IDSPISPOPD -- No Clipping Mode (Walk through walls)
IDDQD	   -- God Mode (Invincible)
IDKFA	   -- Very Happy Ammo (all weapons, ammo, and keys)
IDBEHOLD   -- Menu (Select first letter of word to get it)
IDDT	   -- Full Map (type only in automap)