Sonic the Hedgehog 4 was released to multiple digital hubs such as Xbox Live Arcade and the PlayStation Network in 2010 to fairly solid reviews, that said there were a few complaints such as the game being too short and what some considered odd physics.
Sega has promised to address such complaints and bring the feel of Episode 2 more in line with the classic 16-Bit titles, in the meantime check out the Episode 2 trailer below.