Rogue Legacy, one of the surprise PC hits of the year, has finally found its way to Mac and is currently available via Steam. The game features a never-ending lineage of knights attempting to conquer a mysterious dungeon. Each time you perish, you assume the role of your direct descendent, complete with emotional and physical ailments such as colorblindness, depression and near-sightedness.
If you've already purchased the game via a Windows machine, you'll be able to download the Mac version for free on Steam. If not, the game will set you back a reasonable US$15. If you've never played it, but enjoy the roguelike genre, it's definitely worth the asking price.