Sonic 4’s out again. we’ve seen it in the Steam Directory and such, but a surprise came when Sega re-released the downloadable outing as a new version on iPad app store as “Sonic The Hedgehog 4: Episode I HD”. An HD retreading of the game, this new version has been optimized for the iPad 2 (as reviews apparently say it runs very slowly on iPad 1) and features graphics more reminiscent of the console ports. The main noticeable difference I see is a lack of Cel shading on Sonic, which can be seen in it’s Xbox, PS3 and 360 brothers.
As for the touchy subject of the physics, or if you’re curious about the release, here’s a video for you to decide for yourself:
Source (Pointed to me by Rabid-Noodles):