Doom is a first person shooter where the player's marine must make their way through several levels while avoiding or destroying enemies, solving puzzles and trying to find the exit.
Choose music, pass through walls and be invincibleEdit
These are three of the Easter Eggs that are found in the game.
What to doEdit
To choose to listen to music from a level that is different from the one that you are on, at any time during a level, type IDMUSxx (the x deonates the level number) to listen to music on a different level in particular.
To pass through walls, at any time during a level, type IDCLIP to pass through a wall or door.
Type IDDQD to be invincible through a level