To play Garry's Mod, you need a Source engine game that comes with Source SDK Base. So Half-Life 2, as well as Team Fortress 2, Left 4 Dead, Counter-Strike: Source, Day of Defeat: Source, and Portal, would work. The free Half-Life 2: Deathmatch from the NVIDIA First Slice promo will not work, though.

Write on theineffablebob's Wall

do i need to have hl2 for playing gmod?

Write on anwesh's Wall

To fall and miss the ground is the secret to flying.

Write on theineffablebob's Wall

what do u mean by ur user description?

Write on anwesh's Wall