Classic Sudoku

■ Classic Sudoku, nothing in the way A 9×9 grid, digits 1 to 9, one rule. Every row, every column and every 3×3 box holds each digit exactly once. Every puzzle has a single solution — it can always be solved by logic, never by guessing. ■ Six difficulties Quick · Easy · Medium · Hard · Expert · Extreme. Up to Easy, spotting single candidates is enough. From Expert on, it isn't. Each difficulty has its own level, with stars counting toward the next one. ■ Journey Meadow · Cherry blossoms · Seaside · Snowfield · Night sky… walk through twelve scenes, one stage at a time. Difficulty rises gently, and a treasure chest with coins waits at the end of each chapter. 🎯 Mission stages ask for no hints, no mistakes or a time limit — keep it to earn three stars. ■ Mini Sudoku 6×6 Numbers 1 to 6, about two minutes a game. Perfect for a short break. ■ Daily Challenge One new puzzle every day — the same puzzle for everyone on that date. Pick earlier days from the calendar; a trophy marks every day you finished. ■ Tools that help you think · Notes — pencil candidates into a cell. Placing a digit clears it from the notes around it. · Quick input — pick a digit first, then tap cells. When a digit is complete, it moves on to the next. · Highlighting — tap a digit on the keypad to light up every copy of it on the board. · Hints — fill one stuck cell with the right digit. One per puzzle (three for your first five), more with a short ad. · Undo — take back your last move. ■ Three mistakes, and one more chance A wrong digit stays red and counts as a mistake. Three end the game — but watching an ad lets you continue once per puzzle. ■ Your record Solved count, win rate, best and average time per difficulty, and your streak. The current puzzle is saved, so you pick up exactly where you left off. ■ Also · Light and dark themes · English, Korean, Japanese, Simplified and Traditional Chinese · No account, no sign-up. Progress stays on your device.