Easter egg shrapnel
While playing the game, press ~ to display the command line and type "easter!". Then, all destroyed objects will create Easter eggs instead of shrapnel.
Map select
Display the map selection screen. Then click on the following four bolts (in order) on the box in the top right that displays your name: top-left, top-right, bottom-left, bottom-right. Now press the cursor keys to select a new map.
Suicide jeep
While in the command bunker, press ~ to display the command line and type "fubar!". Then, a jeep armed with a 1000 pound bomb will be created. A single hit on this vehicle will cause it to explode. Note: points, ranks and medals are disabled while this code is in effect.
