Challenge Me Math Workout - Nintendo DS Improve your mind & learn something new with Challenge Me Maths Workout! Play against your friends over DS wireless to see who gets the top score, or just practice playing against the computer. Challenge yourself with Formulate! And Hidden Logic - 2 formula & card based math games Play against the computer or friends over DS wireless communication See how well you are doing in the 'Challenge Me' mode with set puzzle that get more difficult the more you progress!