A couple of fun games on Coolmath-Games.com include "Pixel Quest" and "Flip Dojo." Both games require players to solve math puzzles and avoid obstacles to advance to higher levels.
In "Pixel Quest," players control an adventurer who must make his way through jungles and temples. Players can double jump and dash to avoid falling objects and cross over lava pits. "Flip Ninja" requires players to reach a gong to advance to the next level, but they must flip the entire game board to do so. After flipping the game board, the ninja turns red, and players must find a way to turn him back to black to complete each level.