Batman: Arkham City is a action-adventure video game developed by Rocksteady Studios and released by Warner Bros. Interactive Entertainment. Arkham City is an open world action-adventure game that incorporates elements of stealth and beat 'em up game tactics. Some gadgets obtained in the first game are present at the start of Arkham City, while others become available during play.

Steam is a digital distribution, digital rights management, multiplayer and communications platform developed by Valve Corporation. It is used to distribute games and related media online, from small independent developers to larger software houses; Valve expanded the service to include non-gaming software. Steam provides the user with installation and automatic management of software across multiple computers, community features such a...

Half-Life 2: Deathmatch is a multiplayer first-person shooter video game developed by Valve Corporation. Released on Steam it uses many of the assets from Half-Life 2, and the same Source engine. It features unique levels, optimized for multiplayer arena play, and a few new weapons. Also included are portions of the game's source code, which were the basis for many early Source-based multiplayer modifications. The game is the successor ...

This is an addon mod for the Left 4 Dead 2 video game. It requires the .Net framework 3.5.