Eye-Comfort Sudoku: Classic

Sudoku on a warm paper board, easy on the eyes. Classic 9×9, Mini 6×6 and Time Attack, four levels. Auto Notes and hints when stuck. No account needed, and plays offline.

Sudoku that stays comfortable however long you play. Instead of a stark white grid and saturated colors, the whole board is painted in warm paper tones and calm sage green — easier on your eyes late at night and through long sessions.

■ Easy on the eyes • A warm paper background with quiet sage green accents • The selected cell's row, column and 3×3 box tinted softly • Matching numbers highlighted together, so the board is easy to scan • Wrong entries shown in a gentle red rather than a harsh alert

■ Three modes • Classic 9×9 — sudoku the way you know it • Mini 6×6 — 2×3 blocks, light enough for a spare minute • Time Attack — one focused run against the clock

■ Four difficulty levels • Easy · Medium · Hard · Expert • Time Attack gives you longer as the board gets harder (5 · 7 · 10 · 12 minutes) • Best score saved separately for every mode and level

■ Tools that keep you moving • Auto Notes — pencil in the candidates for every blank at once • Pencil mode — jot your own candidates cell by cell • Placing a number automatically clears the notes it rules out • Hint — three per puzzle, for when a cell will not budge • Undo and Erase — step back at any time • Keypad count badges — see how many of each digit are left

■ Focus you can watch grow • A sprout that keeps growing across every game you play — it never starts over • Every square you work out yourself adds to it, and finishing a board adds more • Seedling → Sprouting → Deep Focus → Blooming → Perfect Master • Finish a board and see your clear time, final score and mistakes together

■ Sound and touch • Distinct sounds for selecting, placing, noting, erasing, hints and victory • A light buzz as digits go in and come out — switch it off in settings • Mute the sound whenever you like

■ Make it yours • Auto-remove notes on entry — on or off • Highlight wrong entries instantly — on or off • Three mistakes allowed, with pause and restart always available • 한국어 · English · 日本語 · 简体中文 · 繁體中文

■ Light and undemanding • No sign-up and no login • Plays without an internet connection • Your records stay on your device

A calm habit for your mind — start with one board today.