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Sven Co-op

Sven Co-op is a Half-Life mod by Daniel "Sven Viking" Fearon that was originally released in 1999. The game was later released on Steam in 2016 after gaining a GoldSource engine license.

The Sven Co-op team was also given the Stukabat textures by Valve (https://discord.com/channels/170051548284583937/170051548284583937/1312329562654380043).

Reportedly the lead programmer David "Sniper" McDermott wanted to change the mod's name to Half-Life: Atomic in the 2020s (https://knockout.chat/thread/67539/46#post-2484393) although this did not end up happening.