Injustice: Gods Among Us Ultimate Edition is free on Steam until 26 June.
It is quite a nice versus fighting game. It does not play like Street Fighter and also does not play like Mortal Kombat. Fighting mechanics aside, you do get to throw your opponent at stuff and also throw stuff at your opponent. A good use of the surrounding environment I say.
Anyone who likes DC heroes or villains should get this game since it is free.