SEGA have put out their original classic, Sonic the Hedgehog for a decent $5.99. The game is a straight port of the original released on the SEGA Genesis. Here are some details from SEGA:
• Blast through Seven Zones including classics as Green Hill Zone and Labyrinth Zone, as well as the Special Stages in an attempt to collect the Chaos Emeralds!
• Classic 2-D Sonic experience on the go for the first time on the iPhone and iTouch!
• Pick-up-and-play accessibility: Play in Full Screen or classic “Arcade” look and play with just the touch of a button.
Some reviews on iTunes have reported problems with slowdown when there are a lot of items on screen. Specifically, when a lot of rings are bouncing around. Other than that, it seems to be a solid port that remains faithful to the original. If your thinking of taking a trip down nostalgia lane, Sonic the Hedgehog should be right up your alley. Check it out on iTunes.