No, you do not need to be on the game you bought with Gmod to play it although you do need to have the game installed to run gmod and i also recommend having the game Half-Life 2 installed to get most of the textures and weapons and npcs and props that go along with it.
You need to download Gmod 9.0.4c when you start there will be 3 choose unmark the Gmod 9.0.4b and your set to go and play gmod 9 online.
go to the steam website, and look for gmod 10 there, but to play it you need to download steam.
you can use gmod in any way you like its pretty much a free roam game where you can spawn things and download addons the gmod website its an awsome game hope you enjoy! p.s. if you dont have a steam account you cant play gmod and you also need a game source by lolkid007
Yes and no... Gmod is its own game so it doesn't need any other games in order to run; however, if you want to play online a lot of the good servers require a texture pack from Counter Strike Source. So if you are buying the gmod for single player I recommend it its a great game! If you want to play online I suggest buying CSS.
No. Gmod is only for PC
You probably have an illegal copy of the game. You must buy the game. it's only $10. you must also buy another source game to run gmod such as Half Life 2. then you can play online.
gmod 9-i dont think gmod 10- im sure, no
No, you do not need counter-strike to play gmod. I don't even have counter strike but i do have gmod. A word of warning though, a lot of the materials and weapons in counter strike are used in garrysmod. Mostly in mods, and maps. It is recommended to have it.
No you can not
gmod 9, yes gmod 10-no
The 10-day trial is a free download, but the game itself must be bought to play it proper.
simply press E on the keyboard next to the cars door :) i play gmod add me on steam username is kayden