“Brain Quest,” the popular educational game from Workman Publishing, is now being played on Apple iPhone and iPod “touch” devices through an application developed by Durham-based .

Financial terms were not disclosed.

Workman touts Brain Quest as the No. 1 selling education game in the U.S. are $9.99 per grade level.

Modality focuses on helping clients make their applications and solutions work on Apple devices.

"The Brain Quest activities that parents and teachers know and trust really come alive for the kids on the iPod touch and iPhone," said S. Mark Williams, Modality’s chief executive officer and founder. "Animation sequences and Multi-Touch user interactivity keep youngsters excited and engaged. They tap, flick and fly through thousands of grade-specific questions as they strive to earn Genius status at the end of the game."

Named one of 10 recipients of the “Apple Award for Innovation in Science” last year, Williams and his company recently teamed with international publisher Wiley to take Frommer’s Travel Guides to Apple iPhone and iPod Touch devices.

Financial terms of that deal were not disclosed, either.

Williams, who also is an adjunct professor at Duke University, and Modaility focus on applications for Apple mobile devices.

Modality helped Workman develop “Brain Quest Blast Off,” which includes multipl levels of interactive challenges in math, language arts, science, social studies and a “grab bag.”

Players earn points and other awards.

Modality is .