Play Shingoki Online — Free
Draw a single closed loop visiting all circles. Numbers on circles indicate how many times the loop turns at that circle.
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About Shingoki
Shingoki is a loop puzzle played on a grid of numbered black and white circles. You draw a single closed loop passing through all circles. White circles require the loop to go straight through without turning; black circles require exactly one turn. Each circle’s number indicates the total length of loop segments on both sides of the circle in the two directions it connects.
The numerical constraints at each circle give Shingoki a richer information density than similar loop puzzles. A black circle with the number 3 means the loop turns here and the combined straight run on both sides totals 3 cells. These counts rapidly eliminate candidate paths near each circle.
Shingoki is less widely known than Masyu but has a devoted following among loop-puzzle enthusiasts. The combination of directional (turn/straight) and counting constraints makes each circle highly informative, leading to faster and more decisive deductions.
Start with circles that have the smallest numbers — these allow the shortest possible loop segments, which severely limits how the loop can approach them. The intersection of directional and length constraints at these circles often forces the path immediately.
Frequently asked questions
What is Shingoki?
Shingoki is a loop puzzle. Draw one closed loop visiting every circle. Black circles mean the loop turns there; white circles mean the loop goes straight. Numbers on circles indicate the total loop length passing through in some variants.