Online Competitions to Win

Killer Sudoku is a fiendish variant of Sudoku – the same 9 x 9 board with rows, columns and nine boxes that must be filled in with all the numbers 1 to 9. But instead of seeing some starter clues where some cells are completed for you, in killer sudoku areas of the grid are “caged”. Each cage contains a single number which is the sum of all the solutions in that shape. You have to use this information to crack the Sudoku, but all the normal strategies of Sudoku still apply.

The deadline is Saturday night, any time up to midnight.

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