The New Sudoku Players' Forum

[999_Springs]

I don't know if this has already been invented but I don't think that it has.

I have no idea what to call this type of puzzle.

You have a Su-Doku grid with no numbers, just pencilmarks. You then use techniques to find all the numbers which go into the cells.

I think that this produces much harder puzzles than what can be achieved with normal Su-Doku.

For example, all ordinary 4x4 Su-Dokus can be solved with singles only, but not this one I created.

Code: Select all

1311 3421 3131 2413
1432 4422 1412 2231
4321 1423 2421 3412
1314 4223 3424 4312


(Tip: You can immediately get rid of duplicate and triplicate candidates.)

[udosuk]

I don't know if this has already been invented but I don't think that it has.

I have no idea what to call this type of puzzle.

You have a Su-Doku grid with no numbers, just pencilmarks. You then use techniques to find all the numbers which go into the cells.

This has already been invented for a long time ago. The name of this type of puzzle is Sukaku, short for "Suuji Kakure", meaning "The digits are hidden".

See this thread: http://forum.enjoysudoku.com/viewtopic.php?t=4929

And this page: http://www.sudocue.net/sukaku.php

But thanks for bringing up the idea of 4x4 Sukaku... Should add some twist to this size of puzzles...