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Mathdoku or Calcudoku Online (Logical Thinking Puzzle Game)



Mathdoku or Calcudoku Online (Logical Thinking Puzzle Game)
This puzzle is very nice variation of Sudoku. Each puzzle consists of a grid containing blocks surrounded by bold lines. The object is to fill all empty squares so that the numbers 1 to N (where N is the number of rows or columns in the grid) appear exactly once in each row and column and the numbers in each block produce the result of the math operation shown in the top-left corner of the block. In Mathdoku a number may be used more than once in the same block.
One can play puzzles for one full week.
One new puzzle uploaded everyday.
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