Kingdom Rush, an enormously popular game, has just gone from 0 - 60 in the awesome meter by dropping it's already low price to the best price you can find in the App Store -- free!

Now this fun little tower defense game with its sharp retina display, cute graphics and engaging gameplay can be yours for the low, low, price of nothing! Check out some of the game's features:

• Epic defense battles that will hook you for hours!

• Command your soldiers and see them engage in hand to hand cartoon battles!

• 8 specialized tower upgrades to customize your strategy! Mighty Barbarians, Arcane Wizards, Forest Rangers to name a few.

• Over 18 tower abilities! Have your Sorcerers summon earth elementals and polymorph your enemies!

• Over 45 different enemies, from Goblins to Demons each with their own skills! (Beware of the mountain Trolls!)

• Intense boss fights never seen on a defense game!

• Hours of gameplay with over 50 achievements

• Extra game modes that will challenge your tactical skills to the limit.

• High definition awesome illustrated cartoon art!

• In-game encyclopedia with information from your towers and enemies.

• Retina display!!!

What are you waiting for? Head to the App Store and download now for your iPhone! Sorry iPad users, it's still $2.99 for the HD version.