SudoKu Master: Sudoku Academy

SudoKu Master is a Sudoku app that teaches you how to solve, not just what to tap. PLAY 480 hand-verified puzzles: 80 levels each in Beginner, Easy, Medium, Hard, Expert and Nightmare. Every puzzle has exactly one solution and a logical path to it — the solver checks each one before it ships, so no puzzle ever needs a guess. Beginner, Easy and Medium are open from the start. Hard, Expert and Nightmare open after five completed levels in the difficulty below. LEARN 59 techniques in seven stages, from reading the grid to the structures that extreme puzzles need: Foundations, Intersections & Subsets, Single-Digit Patterns, Fish & Wings, Uniqueness, Chains, and Professional Mastery. Each lesson says what to look for, why it works, and the common mistake — then hands you a real puzzle that needs it. Every technique has up to 50 generated practice positions, each one machine-checked against the technique it claims to teach. A position the validator cannot verify is never shown. ADVENTURE Shape puzzles: a standard 9×9 grid whose cells form a recognisable outline — a bridge, a cup, a staircase, a heart. They run along one numbered path from easiest to hardest, and every level on the path has a verified puzzle behind it. REVIEW Every game is recorded move by move, with candidates, mistakes and timings. Step through a finished puzzle like a chess game and watch your own reasoning back. Awards track streaks, solves per difficulty, learning progress, precision, technique breakthroughs, rare discoveries, stage mastery and Adventure. Daily Progress shows a calendar of what you played and when. MAKE IT YOUR GAME Four play-style presets — Guided, Standard, Focus and Paper — and an individual switch behind each one. Paper mode behaves like pencil and paper: no red marks, no mistake counter, no automatic pencil marks, just a "Check puzzle" button at the end. Selection, peer, same-digit and conflict highlights each have their own colour and their own on/off switch, with a contrast warning when a custom colour would be hard to read. Sounds and haptics are separate switches. So are reduced motion and high contrast. Notes, Auto Notes, Clear Notes, Undo, Erase, Check and layered Hints are all there, and each one can be turned off. FREE TO PLAY Everything in this version is free: one new technique lesson a day, practice level 1 of every technique, two new Adventure puzzles a day with free replays, and every difficulty and level you unlock by playing. PRIVATE BY DEFAULT No account, no sign-up, no analytics, no crash reporting, no advertising identifiers, no tracking. There is no server behind this app: your games, progress, records and settings are stored on your device and nowhere else. iPhone, iPad and Mac.