https://www.pcgamer.com/spec-ops-the-line-is-free-on-the-humble-store/

Spec Ops: The Line is a hell of a game. On the surface it's a conventional third-person military shooter, but it goes places and does things that you don't very often run into in videogames. I will say no more! Except to say that it is currently free on the Humble Store.

Spec Ops was definitely not a hit when it came out in 2012, probably because it looked at a glance like an unremarkable shooter, where you and the rest of Team Ooh-Rah go in and shooty-bang-bang some guys and 'save the world' and whatever. Nothing about it appeared to stand out, and the parts of it that did prove exceptional were neither immediately apparent nor the kind of things that lead to "that was awesome!" moments on Discord.