Advanced · Free · Expert band
Extreme Sudoku online free
Extreme Sudoku for solvers who outgrew Hard. Same classic rules, expert clue target, unlimited regenerations.
Play now · expert
Extreme board loaded
Who should play extreme Sudoku
Extreme Sudoku is for players who already finish Hard boards and want longer sessions. If you still rely on guessing, step back to Medium and drill Naked Pair and Pointing Pair until they are automatic.
Training plan for extreme boards
- One Medium daily for speed (under 8 minutes).
- One Hard daily for candidate discipline.
- One extreme/evil board when you have 30+ quiet minutes.
- After each stuck point, read the matching technique page once.
More hard content
FAQ
- What is extreme Sudoku?
- Extreme Sudoku is a marketing name for very hard classic Sudoku. Rules are unchanged: rows, columns and 3×3 boxes must each contain 1–9 once. Difficulty comes from fewer clues and longer logical chains.
- Extreme vs evil vs expert — which is hardest?
- On Zeloku, extreme and evil both use the expert generator band. Labels differ because searchers use different words; the boards share the same low-clue target and uniqueness guarantee.
- How long does an extreme Sudoku take?
- Anywhere from 20 minutes to over an hour depending on technique fluency. If you finish Medium in under 6 minutes, you are ready to attempt extreme boards.
- Can I get help on extreme Sudoku without spoiling the whole answer?
- Yes. Open the full daily Expert board for Hint (names the next technique) or paste the grid into the Sudoku solver for a single step.