Legendary 16x16 Sudoku is reserved for the most skilled solvers. Rated 10.0 and above by Sudoku Explainer, these giant puzzles combine the hardest known logic — dynamic forcing chains, contradiction nets and ALS patterns — with the sheer size of a 256-cell board. Progress is measured in single verified eliminations, and a solve can take many hours spread over many sessions.
Legendary giant grids come from the hardest published 16x16 collections, each verified to have exactly one solution. They are the summit of what this site offers. For the 9x9 equivalent, see legendary 9x9 Sudoku.