Daily Sudoku
20 Dec: easy , medium , tough 19 Dec: easy , medium , tough 18 Dec: easy , medium , tough 17 Dec: easy , medium , tough 16 Dec: easy , medium , tough 15 Dec: easy , medium , tough
easy Can be solved using single techniques: there is only one candidate in a cell, or there is only one cell in a row/column/block where a number can be placed;
medium You need more advanced techniques, such as combining the positions in different rows/blocks or columns/blocks, or pairs of numbers that can only be placed in two cells (naked/hidden pairs );
tough Can't be solved with these techniques only.
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