Garry's Mod

Garry's Mod 

Official site : http://www.garrysmod.com/

Steam url : http://store.steampowered.com/app/4000/?snr=1_7_15__13

Gmod Video random Entertainment : Press here to watch the video

What is Gmod? :   Garry's Mod  is a sandbox physics game using a modified Source engine, created by Garry Newman. Garry's Mod has been available on Valve's content delivery service, Steam, since November 29, 2006.Purchase of Garry's Mod requires the user to own at least one game on Steam based on the Source engine, such as Half-Life 2, Counter-Strike: Source, Portal, or Team Fortress 2. It is also commonly used for the creation and publishing of videos on YouTube, mainly from Team Fortress 2, Half-Life 2, Portal, Left 4 Dead and Left 4 Dead 2. Garry's Mod was originally a modification for Valve's Half-Life 2, but was later made into a standalone Steam game that was officially released on November 29, 2006 dubbed Garry's Mod 10. The current version, Garry's Mod 13, was released October 24, 2012. In March 2013 it was revealed that the game has made over 22 million dollars. As of November 2013 the game has sold 3.5 million copies.

Multiplayer :   Garry's Mod supports multiplayer gameplay on dedicated game servers. These servers are operated by the community and some servers earn a profit from having additional VIP features. Players can build contraptions together and communicate via text or voice.
Garry's Mod servers run many game modes, most of which are user-created modifications. Some of the more popular modes include: Roleplay (RP) where players take on a specific role in the server's society, where players role-play in a city-like society and Trouble in Terrorist Town (TTT), which involves a group of terrorists (Innocents) (this can also include a group of detectives, who have special tools aid in finding traitors) with another, smaller group of traitors within them, whose goal is to kill all of the Innocents; as well as several zombie survival mods. There are also Deathrun servers where the "Death" players trigger traps to try and kill the other players that are trying to get to the end of the level, which is usually an obstacle course, of sorts.

Comment : I will rate it with 7 for Co-op and multiplayer cause you can play full of mods and maps.

I really like the horror Co-op maps and gamemods.