Rules are simple! Absolutely no doubt that if you like logic puzzles fit. Rules 1. Connect dots with vertical / holizontal line and make one loop. 2. Numbers define how many lines can be drawn around it. 3. Lines cannot be crossed or branch off. Slither Link http://www.nikoli.co.jp/en/puzzles/slitherlink.html The explanation about the button [＋] Zoom In [－] Zoom Out [↓] A save of progress on the way(3 at the maximum) [↑] The reading of the state of preservation Long Tap: Undo the reading