There's been an error in issue 68's suduoku. The coloured squares were missed off by accident when we went to press. The squares that should be coloured are:

First column, four squares down from the top-left (the number above the 9)
Four columns in from the top left, right at the bottom (the number below the 2 and next to the 4)
Eight columns in from the top left, five squares down (the number between the 8 and 3)

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