Update after eternity...
The latest update before this one was released back in August 2012 (when iOS 5.1.1 was, at the time, Apples most recent version of iOS - to date is still the best version Ive ever used) While the graphics are 10 times better, the game is also 10 times slower, and it constantly freezes every time I reach 100 rings. I expected more from an update that took 4 years to complete. That aside, the game itself is pretty fun.
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Sonic The Hedgehog 4™ Episode I, v1.5