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Raijin Software Releases Kopfnuss App for Training Mental Arithmetic

May 28, 2010 - Hamburg based software company Raijin Software today released Kopfnuss, their mental arithmetic training application for iPhone and iPod touch. Kopfnuss features basic arithmetics, the rule of three, roman and square numbers and calculating basic sums of money - all for different skill levels. Apart from practicing 10 exercises in a row, the time pressure mode allows users to compete for the highscore and earn trophies for fast problem solving.