Action, RPG, FPS, Co - op. $ Terraria. Sandbox, Adventure, Survival, 2D. $ Garry's Mod. Sandbox, Multiplayer, Funny, Moddable. One of our favorite reasons we like free to play games is that many of them give us the ability to play with our. Hai guys(: Recently, I've been looking for a co - op game (thats free,seeing as I dont spend money on games) and I need a suggestion from. The netcode is really good, I had no trouble playing with a friend across the globe. Yeah, this list is bullshit. Btw, you clearly chose to exclude MMOs. SimulationMultiplayerAgricultureOpen Goldwn gate. ActionAdventureIndieRPG.