Sonic 4: Episode 2 will be released May 15 for Xbox LIVE Arcade, PSN and PC, SEGA has announced.

The Xbox LIVE Arcade game is priced 1200 MS Points, whilst PSN and PC will set you back £12.99.

SEGA has also announced Episode Metal Lock-On, a special unlockable story that will be available exclusively to players that have purchased both Sonic the Hedgehog 4 Episode I and Episode II.

Episode Metal Lock-On will bridge the story between Sonic CD and the Sonic 4 Saga and reveal the origins of Metal Sonic. The extra features four exclusive acts, from Stardust Speedway to the events of Sonic 4 Episode II, playing as Metal Sonic himself.