🧩 Level 4 - Puzzle #222
📊 Professional
⭐ Hard
📝 69 Steps
🔧 6 Techniques
🎯 Current State
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🔧 Techniques Used
Hidden Single
51×
Pointing/Claiming
11×
Naked Quad
3×
Naked Pair
2×
Naked Single
1×
XYZ-Wing
1×
📋 Solution Steps
All
Singles
Locked
Subsets
Fish
Wings
Chains
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