Free Sudoku Puzzles Online - Number Place - Extreme

Frequently Asked Questions

How hard is Extreme?

Extreme is the highest difficulty on this site. The puzzles demand X-Wing and even more advanced techniques used in combination.

What techniques do I need to solve an Extreme puzzle?

A full repertoire of advanced techniques including X-Wing, plus the focus to track multiple candidate patterns at the same time. Careful candidate management with the notes feature is a must.

What should I do when I cannot solve an Extreme puzzle?

Going back to Master and practicing the advanced patterns is the fastest route. Not finding a cell with the basic techniques alone is normal at this level, so narrow down the candidates one step at a time without rushing.