Fill in the 25 squares with the top five (in terms of population – less if fewer than 5 qualify) World 50K+ cities based on the categories in the top row and the geographical location given in the cell. For example, if you are looking at a cell with ‘Europe’ in its row, and ‘2+ Words’ in the column, that cell can be filled in with ‘St Petersburg’ as it is one of the 5 largest 2+ Words cities in Europe. When a cell is completed it fills in green.

Occasionally a cell may not have any qualifying answer, in which case it will be filled in bright green and be a gimme. Cells will get progressively greener until all 5 (or less if less than 5 qualify) are answered. Some cells with less than 5 valid answers will start with a green shade corresponding to how many answers are left.

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