Hardest math sudoku is a classical sudoku game, which has simple arithmetics instead of numbers.it contains 24 unique puzzles.
keygames.com - Choose your shapes and symbols in this variation of the ..
silvergames - Math duel 2 player is a cool educational game for 2 players ..
mochimedia - Too hard sudoku! over 1400 of the hardest sudokus. only for ..
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