The Binding of Isaac
1 day 21 hours
Sigils of Elohim
Counter-Strike: Global Offensive
105 days 20 hours
8 days 3 hours
2 days 9 hours
Can confirm Fistful of Frags is great fun. Adding to the list: the new Unreal Tournament, No More Room In Hell, Halo Online (search for it on reddit, it's basically Halo 3 on PC).
I've never tried: Brawlhalla, Tribes: Ascend, Dirty Bomb or Loadout
Dirty Bomb and Loadout are really cool, you should try them!
Good luck making money on a free single player game
Clicking on links in articles to retailers or publishers may mean we earn a small commission. More