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Normal Sudoku rules apply, except the numbers in the cells contained within grey lines add up to the figures in the corner. No number can be repeated within each shape formed by grey lines.

For a helping hand call our solutions line on 0906 200 83 83. Calls cost £1.03 per minute from a BT landline. Calls from other networks may vary and mobiles will be considerably higher. Service supplied by ATS. Call 0330 333 6946 for customer service (charged at standard rate).

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This article titled "Observer killer sudoku" was written by , for theguardian.com on Sunday 14 January 2018 12.01am

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