Put down the Bat Credit Card, Bruce. Netherrealm’s “who would win in a fight” ’em up, Injustice: Gods Among Us, is currently free to download and keep. For one reason or another, WB Games have chosen to give away the Ultimate Edition of their 2013 fighter on Steam ’til Thursday 25th, letting you pick up some surprisingly good superhero brawls for nary a penny.