Evil printable sudoku
Keep candidate notes readable and distinguish confirmed entries from assumptions. When a deduction depends on several lines, verify each link separately.
Ready to print 4 printables
Levels
- Diabolical
- Long chains
Try an example
Keep candidate notes readable and distinguish confirmed entries from assumptions. When a deduction depends on several lines, verify each link separately. Aim to explain why an option is eliminated before entering the next digit.
What to check
Difficulty names are not a universal scale. If you need help, review one specific deduction or return to a level where you can follow the logic without guessing. The number of given digits alone does not determine the challenge; their relationships matter too.
Write only what you can justify
Compare the row, column and box before entering a digit. If several options remain, note them as small candidates and return later. An entry is confirmed by the board’s rules, not by making a row look neatly ordered.