10. Half-Life 2: Deathmatch – November 2004
Built in Source and using assets from Half-Life 2, HL2 Deathmatch is a multiplayer shooter developed by Valve and released as a separate product. It was fun. Using the gravity gun in multiplayer meant you could kill people with random objects. And HL2 Deathmatch would end up being important for multiplayer mods built using the Source engine, providing fans with useful features in the engine. However, it’s fairly simple, lacks any story, and is mostly a ghost town in 2021.
