SudoZen

What it does

Play classic Sudoku and 12+ variants (Killer, X-Sudoku, Thermo, Arrow, Anti-Knight, Palindrome) online for free at SudoZen. Step-by-step solver with logical hints, pencil marks, cell colors, and interactive strategy guides for all skill levels.

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  sudoku.coach2023 · ▲99

  The best way to learn and play Sudoku

• SP
  SudokuVariants – play and construct different variants of Sudoku2025 · sudokuvariants.com · ▲28

  Hi HN, I've been working on this Sudoku web app for the past couple of years, on and off during free weekends and afternoons. I started working on it because I was bored during COVID, and Cracking the Cryptic had just become popular on YouTube, which got me wondering how hard it could be to make a Sudoku app. The main idea is for the app to understand the constraints and know how to solve Sudoku grids (and not just be a simple Sudoku drawing/playing app). When it comes to classic Sudoku, the solver doesn't support anything more complicated than X-Wing, but it understands the…

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  Free Sudoku OnlineApr 2026

  sudoku, online sudoku, sudoku solver

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