A new MOD based on Alien Swarm 2011 version. It is an independent game that does not need a installed Alien Swarm. Many data about marines and equipments are edited for players to adapt the high difficulty. As the base version of game is different to present Steam version, some functions of the latest version are disabled, such as Brutal mode, Onslaught and Friendly fire hardcore. Because the latest version moves marine skills into Source code, I cannot help with it. Then I chose the proper version to edit. As to which features are enhanced, please read the introduction. Stronger marines, better experience!