5th Grade Logic Puzzles: Masyu Puzzles - Best Logic Puzzle Collection for Kids

(also known as "Shiroshinju Kuroshinju", "White pearls and black pearls") is a type of logic puzzle. It is played on a rectangular grid of squares, some of which contain circles; each circle is either "white" (empty) or "black" (filled). The goal is to draw a single continuous non-intersecting loop that properly passes through all circled cells.