Strategy Informer  

It seems that an incomplete build of Sonic the Hedgehog 4: Episode 2 was accidentally leaked on Steam. While the game was removed from Steam, users posted images of the PC version for all to see.

The Xbox Live Arcade and PlayStation Network versions of the game are due to be released in mid-May, while the PC version has not yet been dated.

Source: Kotaku

Related games: Sonic the Hedgehog 4: Episode 2 (PC)