This game for free?! Insane!

Make no mistake, this is a robust TBS WW2 game, sporting a massive plethora of units and scenarios spanning across multiple theaters.
It has continuous campaigns that see your face through a series of historical scenarios. The closest competitor to it on the platform is the Battle Academy 1/2, priced at 20$ base for a simplified variation on this theme.
You get Open Panzer for free. Yes, bloody free.
I am mystified by this, but in a good way.
If you are into moderately deep historical TBS - get this game now.
Be warned, though, tutorial does not teach everything there is to know about the mechanics, and the game is HARD, really, really hard (or at least, my German/Polish campaign was). Be prepared to lose early on.

Imaginary Star Studios about Panzer Marshal