Enter the numbers 1 - 6 so that each number 1,2,3,4,5,6 appears once in each row, column and 3 x 2 shaped box. Some cells have a little number at the top right: this tells you what the sum of the cells of the same colour comes to. To get started, look at cells that have numbers already placed in - in this example you have '3' in the bottom right cell, so the number above it must be 1, as the only way to make 4 is from 3 + 1.

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