Puzzle 18 - Masyu

Wow, this took quite a while to make! I originally wanted this to be on a 17x17 grid, but realized the odd number of pearls on the edges made it impossible. This theme was surprisingly hard to construct, and uniqueness was hard to prove at the end. However, I think it turned out quite well. 

Rules- Draw lines through orthogonally adjacent cells to form a loop that goes through every circle. The loop cannot branch off or cross itself. The loop must turn on black circles and travel straight through the cells before and after the circle. The loop must go straight through white circles, and turn in at least one of the cells on either side.





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