David Haye's Knockout Version 2.0 is now available to buy from the App Store for just £0.69. The game has so far proved popular on iPhone and iPad, and the new update will include the following features: crisp retina graphics, achievements, leader boards, three new levels and three new enemies. Gamers will also get to compete with Haye for the top score, should they so wish.
Here's some screens:
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