Sudoku — Logic Refined
Hints that teach the technique, not just the answer.
- 6,400 hand-picked puzzles, graded beginner → AIC chains
- 80+ solving techniques: X-Wing, Swordfish, XY-Wing, AIC, and more — every hint names and explains the technique used
- Optional AI explanations — bring your own OpenAI key
- Step-by-step replay of your solve path
- Fully offline · 6 languages (EN/JA/zh-TW/ES/DE/FR)
- iPhone · iPad · Mac (Apple Silicon)
$7.99 one-time · No subscription · No ads · No tracking
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