Sonic the Hedgehog 4: Episode I

Project Needlemouse is a code name for a platform video game in development as part of the Sonic the Hedgehog series. It is targeted for release in 2010. The game was first announced through GameSpot by Sega of America on September 8, 2009, the eve of the tenth anniversary of the launch of Sega's Dreamcast video game console and the release of its launch game, Sonic Adventure in North America.

The game will be a two-dimensional side-scrolling platformer reminiscent of the original Sonic games, with an emphasis on speed. It will be playable in high definition.