One of the defining tower defense games on iOS was kingdom rush (Free), whose mix of hero-based gameplay and standard tower defense elements has helped make the game a hit across three separate entries so far. While it’s hard to imagine many TouchArcade readers who haven’t checked out at least one entry in the series – especially since they’ve gone on sale or free at various times – if you haven’t done and want to see what it’s all about. all about, Ironhide Games has announced that the first kingdom rush is now free forever.
— Ironhide Games Studio (@ironhidegames) September 8, 2015
The game is still supported by in-app purchases, mostly for the extra heroes you can buy instead of unlocking, so it’s not hard to see where this could still make some money for Ironhide, maybe even more than before. The previous games have all been apparent successes, so it could be Ironhide’s experiment to see if they can go completely free for a future title. Or hey, maybe they’re just trying to squeeze a little more of a long tail out of a game that’s now several years old.