This game is the combination of Hypersudoku and Sudoku X. There is a grid of 9 x 9 squares, further grouped into 9 groups of 3 x 3 squares. You need to put numbers 1 to 9 into the squares so that the numbers in each row and column do not duplicate, and the numbers in the 3 x 3 square groups also do not duplicate. This is basic sudoku. In Hypersudoku there are an additional 4 groups of 3 x 3 squares that are coloured, and the numbers in these groups should also not duplicate. Finally the additional constraint of Sudoku X is applied, i.e. the numbers in each of the two diagonals should also not duplicate. As you can see there are more constraints and so you need to look at more places to decide which number should go to which square. It is more complicated and also more fun. The faster you finish, the higher your rank.

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