Easter Eggs

Valve Hammer Editor

Go To Coordinates

If you type the point 200 -4096 1154 in the Go To Coordinates dialog, a dialog appears saying:

Day of Defeat: Source

WTF

The voice command voice_wtf makes the user say Whiskey Tango Foxtrot!

Half-Life: Blue Shift

[1] [2] [3]

Half-Life: Opposing Force

Duke Nukem?

opposing force.gcf\sound\drill\dr2_add04.wav: "It's time to kick ass and chew bubble gum, and I'm all outta bubble gum."

Win the Game

After processing opposing force.gcf\sound\misc\dsbossit.wav (unused sound): "To win the game you must kill me, Randall Pittsford." [4] GoldWave→Effects→(Reverse + Playback Rate→16000 + Filter→Noise Reduction→Initial noise)

Haiku

Open the console and enter haiku to make the game put together a random  haiku for you. All the lines can be found in the file opfor.dll.

A possible haiku

Team Fortress 2

A birthday Easter Egg!