There are far too many excellent turn-based strategy games to play them all these days, and with even more coming to PC everyday, going back to the landmark releases gets harder and harder. But if you missed it, Invisble, Inc from Don't Starve developer Klei Entertainment is worth a return, particularly if you miss XCOM 2, and need something to fill the gap before (hopefully) XCOM 3. Oh, and if it helps, you can get it for just $3 right now.