VariantDoku: Variant Sudoku

Master 1,900+ variant sudoku and 450+ classic grids — smart step-by-step hints, daily challenges, cloud sync, no ads. Killer, Kropki, Thermo and more.

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 1,800+ variant and zero-givens puzzles, every one verified to have a single solution reachable by logic alone. No ads, ever — free or paid.

WHY SOLVERS STAY

• 1,800+ variant & zero-givens puzzles: killer cages, thermos, kropki dots, XV, arrows, renban, German whispers, palindromes, diagonals, anti-knight, and more
• 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 iPad 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 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 (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/