King of the Server

From Valve Developer Community

<Half-Life 2> King of the Server was an advanced deathmatch mod for Half-Life 2. It featured persistance across servers, character progression through earned experience, and upgradeable stats, skills, and equipment.

It was created as a quick proof-of-concept side project for Hostile Planet, a persistant RPG based on the Source engine. It was intended for a relatively small community to stress test the concept, but was eventually leaked to a few large communities, and taken down.

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