Sudoku Challenge: Numbers

Sudoku that teaches you: every hint explains WHY — plus a 12-lesson Academy that takes you from first steps all the way to X-Wing. DAILY CHALLENGE — one puzzle for the whole world each day, with resume-anytime saves and an Elo-style Rating that grows with you. SUDOKU ACADEMY — 12 interactive lessons: cross-hatching, leftovers, pointing pairs, naked pairs, X-Wing and more. From playing to truly solving. HINTS THAT TEACH — hints don't just fill the answer. They highlight the cell, name the technique, and walk you through the logic. ADVENTURE MAP — 8 regions, 100+ levels, star chests and Boss fights. Unlock four variants: Killer, Diagonal, Jigsaw and Letter sudoku. MORE MODES — Classic with 6 difficulties, Speed runs, Survival stages and Endgame sprints. 100% FREE — NO ADS. NO IN-APP PURCHASES. NO DATA COLLECTION. No account needed. Everything stays on your device — uninstall deletes it all. Plays fully offline. 10 minutes a day keeps your brain sharp.