Back in November of 2004, Bigman10 released a mod for Half-Life called OutBreak. In this mod there is a zombies vs humans scenario. Bots are also included. Just type addbot into console The mod was only available on Planet Half Life through a mirror on Fileplanet. Since then, the mirror has removed the dated file. There is no way to get this mod anymore. No matter how hard you search, it is impossible to find. I was lucky enough to download this mod before it was deleted, so I will share it with you guys. Here is the original summary from Planet Half Life: This is a multiplayer only Half Life mod. You play as humans or zombies, The goal is to wipe out the other team. You have an arsenal of items at your disposal witch can help you do this.