5-15min
數獨挑戰·閃電
每日一題，三檔難度計時，唯一餘數法入門首選。
3 plays left today · Log in to earn +5 points per playView Illustrated Guide →
Free 3 plays · This round doesn't count
Arrow keys / touch · Space to pause
Trial zone is a static placeholder; game engine + ticket/points system will be integrated after launch
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