CALCUDOKU

CalcuDoku are math based puzzles coupled with logic. Unlike other logic puzzles, CalcuDoku uses addition, subtraction, multiplication and division in ways which are deeper and more gratifying than anyone can imagine.
CalcuDoku puzzles come in many sizes and range from very easy to extremely difficult taking anything from five minutes to several hours to solve. However, make one mistake and you’ll find yourself stuck later on as you get closer to the solution.
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This game is supplied by http://www.conceptipuzzles.com/