Any Source game.
This includes:
Half-Life 2 (You pretty much get stuff from this in any Source game)
Half-Life 2: Episode 1
Half-Life 2: Episode 2
Team Fortress 2
Portal
Counter-Strike: Source
Day of Defeat: Source
Get any 2 or more of these and you should be set to go, but I really honestly suggest getting all of them, its only about $50 (if you get the $30 Orange Box, which contains all Half-Life 2 games, Portal, and Team Fortress 2, then get CS:S for $20)
Alternatively, Team Fortress 2 is now Free-to-Play and downloading that will allow you to play Gary's Mod, or any other Source mod!
i recommend the vavle pack valve is the creators of steam if u have good gameing PC tho and garrys mod but u must have some of the valve games to play garrys mod great game!
no because garrys mod requires that you have a game that uses the source engine
All steam games update themselves automatically.
You can buy it at the Steam Store. Check the related link.
10 is better, $10 Steam
You Haveto Buy It. On Steam Its 6.99
The game is not sold in stores. It is sold on a game selling company called steam. You would need to make a account on steam and buy it there.
Steam
Buy Garry's mod 10 off of steam.
There is, 10$ Steam
Yes, you do. You need steam and a source game such as Counter-Strike: Source. Or Half-life Source. Day of Defeat Source
10$ through Steam
You do not make an account on Garry's Mod. You need something called Steam. http://tinyurl.com/2vwrgf5
Garry's Mod has now updated and includes all features of 13 Beta
i recommend the vavle pack valve is the creators of steam if u have good gameing PC tho and garrys mod but u must have some of the valve games to play garrys mod great game!
You Do Not Get Garrys Mod Serials, You Buy it Off Of Steam Which can be found at steampowered.com its usually about 21 United States Dollars
No. Go buy it at steam...