This physics based marble game will be released for free December 13. Marble Arena 2 will be available for the Mac, PC, and Linux machines.

From the press release:

    Brightside Entertainment is proud to announce Marble Arena 2, a physics based, free, 3D marble game, featuring vibrant HD graphics, fun and addictive gameplay, and easy to use built-in editor for creating custom levels.

    The game will feature 50 mayhem filled levels, and being a physics based game, it
    will test the player’s rolling skills on several types of surfaces and make use of a multitude of physics contraptions in fun and sometimes headache inducing ways.

    Updated graphics engine will provide vibrant, 2011 looking, HD graphics, while still maintaining compatibility with lower spec’d computers or laptops.

    Players will be pitted against sneaky A.I. controlled marbles in single player games, and against each other in multiplayer games of up to 32 participants.

    The built-in editor will allow easy creation of custom levels, or customization of already existing ones.

    The game will be available on December 13, 2011, for all major platforms (Windows, Mac OS and Linux) and will be completely free.