Counter-Strike: Condition Zero Deleted Scenes Easter Egg - Ritual's "Ritual"

1) Start a new Game.

2) Enable sv_cheats 1 (Press ` to bring out the console).

3) Choose Training Mission.

4) Right after the part of the mission where you use the "Fibre Optic Equipment" and get past the guard.

5) Go though the door and move onwards till you encounter a "Loading" sign.

6) Right after the sign, enable "Noclip" using the console, go though the floor and look around.

7) You would definately see the egg as it is very obvious.