Pencil Sudoku: Variant Puzzles

Solve sudoku the way it was meant to be solved: with a pen in your hand. Pencil Sudoku is built around Apple Pencil. Write your digits and notes directly on a paper-like board, and the app reads your handwriting - learning YOUR handwriting as you play, so recognition keeps getting better. No keyboard between you and the puzzle. Prefer tapping? A complete touch mode is built in, and on iPhone the whole app is designed for it. 43 PUZZLE TYPES Classic sudoku plus a deep library of variants: Killer, Thermo, Kropki, XV, Windoku, Irregular, Diagonal, Arrow, Renban, German Whispers, Palindrome, Skyscraper, X-Sums, Little Killer, Clone, Fortress, Odd-Even, Quadruple, Mathrax, Greater Than, and many more — over 300 puzzles, organized by family so you can find your favorites. MADE FOR SOLVERS • Handwriting recognition that adapts to you — private, on-device, never uploaded • Every note style: corner, center, grid, and Snyder notation • Draw links between candidates for chains and coloring techniques • Bookmarks and rewind to explore bifurcations without losing your place • A customizable favorites bar — your tools, your colors, your layout • Digit spotlight, number lock, and completion shading for fast scanning HELP ONLY WHEN YOU WANT IT Hints escalate gently and never judge — from a nudge toward the right area to a full technique walkthrough. Every assist can be switched off. The app never fills in a cell for you. EASY ON THE EYES A warm, paper-like board designed for long sessions. YOUR DATA STAYS YOURS No accounts, no tracking, no data collection. Your handwriting model lives on your device. Start free. One simple one-time purchase unlocks unlimited play — no subscription, ever.