Zach Gage's popular word puzzler SpellTower is now available in the Mac App Store, arriving as one of the first games to support the recently launched Mountain Lion Mac OS upgrade.

Though the game was designed for iOS touch screens, Gage notes that several tweaks and improvements were made in the transition to Mac OS. SpellTower plays in a vertical window, making it an ideal game to leave running in the background, and an alternate control scheme is designed with mouse controls in mind.

The game also features Retina display-optimized graphics, a Night Colors mode, and Game Center leaderboards and achievements. SpellTower is priced at $3.99.