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No ads. No guessing. Just pure-logic variant sudoku. VariantDoku is built for solvers who want more than one daily grid — a growing library of 1,900+ sudoku variants and zero-givens puzzles, every one verified to have a single solution reachable by logic alone. No ads, ever — free or paid. Plus 450+ classic sudoku in 4x4, 6x6 and 9x9. WHY SOLVERS STAY - 1,900+ sudoku variants & zero-givens puzzles: killer cages, thermos, kropki dots, XV, arrows, renban, German whispers, palindromes, diagonals, anti-knight, and more - 450+ classic sudoku in 4x4, 6x6 and 9x9 — the plain grid when you want it, one tap from Discover - Every puzzle is logic-checked: one unique solution, no guessing required - A new daily puzzle, free for everyone — compare solve times on the daily leaderboard - Home-screen widget keeps today's puzzle one tap away - Audio narration reads the rules and tutorial steps aloud — listen while you study the grid LEARN ANY VARIANT - Step-by-step interactive tutorials for every variant, from your first 4x4 grid to mixed-constraint puzzles - A guided first-launch experience matches puzzles to your level — you're never thrown into the deep end - Already sharp? Skip straight to the expert grids TOOLS THAT RESPECT YOUR SOLVE - Candidate notes, corner marks, colors, and symbols for advanced solving - Error checking and gentle hints — only when you ask - Import puzzle links straight into your Library - Search and filters by difficulty, grid size, and constraint type - Streaks and solve history to track your progress - Dark mode and a calm interface designed for long sessions - Fully optimized for Android phones and tablets in portrait and landscape HINTS THAT COACH, NOT ANSWER - Every hint names the next logical step — Hidden Single, X-Wing, W-Wing, Simple Coloring, Forcing Chain — and highlights the cells it depends on - It reads the pencil marks you already made and builds on them - It never reveals a digit that isn't logically deduced; when the logic only rules candidates out, it shows you that instead of handing you a number THE VARIANTS LIST Sudoku variants supported: Classic Sudoku, Killer Sudoku, Kropki, XV, Thermo, German Whispers, Renban, Palindrome, Between Lines, Lockout Lines, Region Sum Lines, Arrow Sudoku, Diagonal (Sudoku X), Anti-Knight, Anti-King — plus multi-constraint puzzles that combine several on one board, and zero-givens puzzles solved entirely from the variant rules. Variant+ unlocks unlimited puzzles, unlimited error checking, and offline Library play. The app stays 100% ad-free — free or paid. Whether you're learning your first killer cage or chasing your hundredth zero-givens solve, VariantDoku is a calm place to practice and improve. Terms of Use: https://variantdoku.com/terms BUILT FOR VARIANT SUDOKU SOLVERS If you follow Cracking the Cryptic, you already know these puzzles. Paste a SudokuPad, CTC, or f-puzzles link and play it here with full variant rules, pencil marks, and hints. Your imports stay yours: puzzles are decoded and stored on your device, never uploaded to us. Short links need a single lookup to fetch the puzzle — nothing is saved.