How to play Toumei

  1. Draw an ordinary loop through cell centers.
  2. Unshaded pearls must be inside the loop; X marks must be outside the loop.
  3. Each pearl must have orthogonal line of sight to exactly one other same-shading pearl, with shaded pearls and the loop's line segments both blocking line of sight.
UnshadedShaded

Breaks rule 1: Draw an ordinary loop through cell centers.

Breaks rule 1: Draw an ordinary loop through cell centers.

Breaks rule 2: Unshaded pearls must be inside the loop; X marks must be outside the loop.

Breaks rule 2: Unshaded pearls must be inside the loop; X marks must be outside the loop.

Breaks rule 3: Each pearl must have orthogonal line of sight to exactly one other same-shading pearl, with shaded pearls and the loop's line segments both blocking line of sight.

Breaks rule 3: Each pearl must have orthogonal line of sight to exactly one other same-shading pearl, with shaded pearls and the loop's line segments both blocking line of sight.

Solved! :D