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[joe-ilya]

To win the game, you must kill John Romero.

To kill the cyberdemon, shoot at it until it dies.

You can accurately snipe with the chaingun by tapping fire.

Berserk gives you a stronger punch for the whole map, not just when the screen is tinted red.

When you start in Entryway, turn around.

Shoot the satanic markings in The Spirit World to progress in the map.

[peridot]

Does "you should put version at the top of ZSCRIPT lump" count?
Also - in Doom II remember to play with a paperweight on keyboard Shift button.

[A Former User]

I didn't learn about the Berserk thing until recently, sad as it is to say.

[Cuppykeks]

Bait pinky demon bites by running up to them and buy yourself time to shoot and back away while they play out their (melee) attack animation. This can apply well to revenants too.