5-15min
数独チャレンジ・ライトニング
毎日1問、3段階の難易度タイマー付き、唯一の余剰数法が入門に最適。
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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