I learned about this game from Mark Clark's talk at the 2010 MichMATYC Fall Conference. I wasn't sure how it would work out at first, but it turned out great. I hope that you take some time to check it out.
Student Praise for "Mark Clark's Exponent Sort"
"I liked the fact that it was like go fish. Plus it allows a good review while still having fun."
'Matching the exponents was the best part of the game."
"I like the excitement to look for a match. It was like playing concentration."
"Worth trying at least once!"