Derhammer is referring to one of the two app games he and three others created to go with the week-long Klondike Challenge, which pits MSU and University of Michigan students and alumni against each other, with an ice cream social on the line.

“Klondike Challenge is a local app tournament,” Derhammer said. “It is a tournament between the two campuses (where) people play it by playing either.”

The event was created by Derhammer and three partners who wanted to test if adding an in-state rivalry aspect to a mobile phone app game would earn the game more attention, he said.

The two games offered are called Mad Bounce and Tray Slider, with the first game similar to traditional Bejeweled and the second comparable to Angry Birds. Both games are free to download on the App Store, with students choosing what school they will be representing while playing the game, Derhammer said.

The winning school will receive a 15,000-Klondike bar ice cream party sometime next week on campus.

Derhammer was excited about adding an unusual aspect to the game between the two in-state rivals.

“We wanted to test out the rivalry aspect,” he said. “We wanted to use the compete-with-your-rival aspect, so what better way to test it out between MSU and Michigan who share that passionate hate?”