When I started doing Sudoku I often found myself trying to memorize possible values for cells, drawing a mental pencilmarkgrid. There is simply so much information to be found in any grid, that one can't remember it all. The most important thing I've learned so far is to choose what information to memorize.

My answer is yes, but I hardly ever use it. If anybody else has got any good tips on solving without pencilmarks, please post them here and we can try to make a little collection of these techniques.įirst of all, whenever I say that I solve without pencilmarks, peoples first reaction is: 'then you must have a really good memory'. First I'll give you some tips that I've found usefull, then I'll take you through a step by step solution of a couple of extreme puzzles, the way I solve them, and hope that you can follow without making any own pencilmarks. Now I wish to show you that none of those are true.

I often read comments like 'no other than the easiest puzzles can be solved without pencilmarks' or 'techniques that are impossible for human solvers.'. The more I read posts on this forum, the more I get the feeling that I'm the only person in the world who solve exclusively without pencilmarks, regardless off difficulty.

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