Sudoku Analyst -- Check the level of a Sudoku prior to solving it. how to use this site

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Samples: 1 2 3 Almost-Locked 5a 5b 6a 6b Proof+Depth Really Hard

[steps] [chains]

This page checks for several fundamental techniques to solve any Sudoku that has a UNIQUE solution. Click on a technique listed below to find out more about that technique, or click on a step shown to illustrate it.