Sven Co-op, a Half-Life mod that adds two-player co-op to the classic shooter, will be released on Steam in the coming months and will be available for free.Not only has Valve approved the mod for standalone release (meaning purchasing the original Half-Life isn’t required to play Sven Co-op), they’ve also given the development team access to the new update delivery system SteamPipe and full access to the original Half-Life engine. According to the team, this will allow them to create “much larger and more detailed worlds,” as well as make the game much more stable for everyone involved.“We are grateful beyond expression to Valve for their generosity and efforts put forth to make this possible. We’re looking forward to working with one of the greatest game engines ever made, and we can assure everyone that there are many, many more updates to come,” says a statement on the Sven Co-op forums.

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