http://www.garry.tv/garrysmod Garry's mod is a sandbox mod. There aren't any teams and you don't shoot anyone - there isn't even an aim to the game. It allows you to mess around with some of the things in Half-Life 2 that you can't really do in the game. For example, you can position ragdolls by dragging their limbs around then freezing them. If playing with dolls doesn't float your boat then why not build a car. There's plenty of building fun to be had - you're only limited by your imagination. People have built all kinds of things from cannons to houses to bridges.