"Now does that A go into this box here or somewhere further down? No, that can't be, then the column's not right any more." If you hear this you should know that one of your housemates has grabbed your new Elektor. No problem as puzzle fun is for everyone! Send the numbers in the grey boxes to Elektor and enter a prize draw for an E-blocks Starter Kit Professional and three Elektor Shop vouchers. Have fun! The instructions for this puzzle are straightforward. In the diagram composed of 16 × 16 boxes, enter numbers such that all hexadecimal numbers 0 through F (that's 0-9 and A-F) occur once only in each row, once in each column and in each of the 4×4 boxes (marked by the thicker black lines). A number of clues are given in the puzzlernand these determine the start situation.
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