Terraria has very low system requirements and can be played online. The first Left 4 Dead shouldn't be that bad, either. If you're also looking for a non-Steam, Ace of Spades is pretty small and doesn't lag.
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http://www.badideatshirts.com/
Rofl.
I see you like T-shirts. Here, take one: http://www.toysnjoys.com/nintendo/GetALife_Shirt.jpg
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Soldat, Insurgency, Terraria, Mount & Blade, Dota 1, The Rune, Dark Messiah Might and Magic Multiplayer, Halo, GTA (2,3, Vice City, San Andreas), Serious Sam(1-2), Team Fortress 2, Titan Quest, Diablo (1-2), Unreal Tournament, BattleForge and so on...
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I'm looking for good multiplayer games on Steam with low system requirements.
What is your favourite multiplayer game that is playable on crappy old laptops or office PCs?
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