a logic-based puzzle in which several numbers are to be filled into a 9x9 grid of squares so that every row, every column, and every 3x3 box contains the numbers 1 through 9.

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For only $1.29 you can buy the full version of Bdoku. Your purchase gives you access to over 30,000 Bdoku puzzles! Bdoku has 4 levels of difficulty with handy hints you can turn on or off.