Masyu is a loop-drawing logic puzzle where a single, non-intersecting loop that passes through all circled cells is drawn.
The objective is to draw a single, non-intersecting loop, subject to the following rules:
- All circles must be passed through exactly once.
- At black cells the loop has a turn of 90°. The loop must also go straight through the cells immediately before and after on the path.
- At white cells the line travels straight through. The must turn in the cells immediately before and/or after on the path.
A standard 10x10 masyu and its solution.
Unless otherwise indicated, standard masyu rules apply to all variants.
Grey Cirles: In addition to black and white cirlces, grey circles appear which can act as either colour.
Regional: The grid is divided up into regions. The loop must turn an equal number of times in each region.