LIES! pure 100% lies! HL2 rocked.
Garys mod was the most amazing thing that happened to HL2.
Basically, it has loads of little games built into one. Based on the HL2 objects.
BIRDPOO
You can play as a seagul,pigeon,crow or a human. If your a bird you have to try and poo on the humans, humans have to try and shoot down the birds, good fun.
MELONRACE
You a melon, and you have to race, well roll round a track without hitting into the walls or you smash into lots of stickey peices.
PIRACE SHIP WARS
You choose either red or blue pirates, each team gets a boat. You have to steer your boat towards the other teams whilst you, or other team members shoot cannons at them, when getting close use your musket or sword to kill the other team and sink their ship.
ZOMBIE TYPE GAME
theres many maps for this game. You all start off human, and theres AI zombie mobs, when you get killed by one, you becvome a zombie and have to try and get the rest. It gets very fun when your one of like 5 surviving, hiding in the celler of a mansion, killing off the constant swarms of zombies.
JUST BUILD
You can just build stuff on certain servers, you can spawn any object found in halflife2. Using an advanced gravity gun to rotate and place it where you want it. Then welding it together to make weird and wacky creations. You can add thrusters, balloons and much more. It has many tools to help you build crap, such as wheel tool, shoot wheels onto whateva u want.
I went into another essay didnt i, its late.
http://gmod.garry.tv/