This great Tomb Raider game is on sale for 50% off on Steam for only $7.50. I’d say it’s more of a spin off of the regular Tomb Raider series than anything. It’s a real fun coop game although the netcode can be a little buggy. Also I think the crontrols are a little difficult at times if you’re using the keyboard and mouse. There’s a lot of interesting puzzles and they require good teamwork.
A demo is available on Steam.