The revived Sierra label announces the release of Geometry Wars 3: Dimensions, as the Windows, Linux, and OS X editions of the shoot-em-up is now available on Steam. Here's word on the new installment in the series:

Geometry Wars 3: Dimensions is an exciting evolution of the fast-paced twin-stick shooter gameplay the Geometry Wars franchise helped define nearly a decade ago. While the game’s look should be immediately familiar to hardcore fans, it features new 3D action and gameplay modes, a dedicated single-player campaign with 50 levels and revamped online cooperative and competitive multiplayer. It also adds five unique companion drones, new power-ups, electrifying boss battles and community leaderboards. There are also Classic Arcade modes available for those still hungry for the original Geometry Wars experience.