Arukone ("Number Link") consists of a rectangular or square grid with numbers in some cells. The goal is to connect each pair of numbers with single continuous lines. The lines must neither cross nor touch each other. brain games for adults - brain teasers riddles - mind puzzle games - mind puzzles for adults - puzzle games for adults - brain busters - math brain teasers - brain teasers and answers - riddles and brain teasers - brain twister - mind teaser puzzles - mind games for adults - funny puzzles - mental puzzles