🧩 Level 4 - Puzzle #020
📊 Professional
⭐ Hard
📝 77 Steps
🔧 5 Techniques
🎯 Current State
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🔧 Techniques Used
Hidden Single
54×
Pointing/Claiming
17×
Naked Triple
3×
XYZ-Wing
2×
Naked Single
1×
📋 Solution Steps
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