漢字数独 · KANJI SUDOKU

Stop drilling flashcards. Start solving puzzles.

Kanji Sudoku replaces Sudoku's numbers with real Japanese Kanji — drawn from the 100 most frequently used characters at each JLPT level (N5→N1), selected from newspapers, literature, and official JLPT exam data. Every puzzle you solve is genuine vocabulary practice.

─── HOW IT WORKS ───

Instead of digits 1–9, fill the 9×9 grid with 9 Kanji so that every row, column, and 3×3 box contains each character exactly once. Tap a cell, tap a Kanji — simple rules, real learning.

─── 5 JLPT LEVELS ───

• N5 — Top 100 basic Kanji
• N4 — Top 100 elementary Kanji
• N3 — Top 100 intermediate Kanji
• N2 — Top 100 upper-intermediate Kanji
• N1 — Top 100 advanced Kanji

Each puzzle randomly picks 9 Kanji from the 100-character pool of your level. Over time, you naturally encounter and remember all 100.

─── SMART REVIEW (SRS) ───

The app silently tracks your accuracy for every Kanji. Characters you frequently miss reappear more often — automatic spaced repetition, no extra effort required. Orange-bordered input buttons highlight your weak points at a glance.

─── DIFFICULTY & UNLOCKS ───

Start at N5 · Easy. Complete puzzles to unlock Medium → Hard at each level, then progress to the next JLPT tier. Progress saves automatically.

─── SCORING ───

Each puzzle starts at 100 points.
• Wrong answer → −(mistake count) pts
• Hint used → −(hint count × 2) pts
Score hits 0 → Game over. Watch a short ad for +10 bonus points and keep playing!

─── FEATURES ───

✓ 6 built-in themes: Dark, Light, Purple, Ocean, Forest, Sakura
✓ Fully customizable colors in Settings
✓ Show / hide Hiragana readings to test yourself
✓ Score History with best times per level
✓ Daily Challenge mode
✓ Sound effects (optional)
✓ Works fully offline

Made with ❤ to make Kanji truly enjoyable.