How to solve sudoku 6 of 6

Coloring: following the chain of one digit

The hardest technique you’ll meet here, and the most beautiful. Take one digit and look for the groups where it can only go in two places: those two are each other’s opposites. Give them two colors in turn and follow the chain across the board — exactly one of the two colors is the right one.

Simple coloring

Take one digit and follow the groups where it can only go in two places: those two squares are each other’s opposites, so give them two colors in turn. One color is the right one. If a square outside the chain sees both colors, that digit can no longer go there.

Practice this technique Or play a regular sudoku All sudoku techniques Back: wings