Some friends put forward problems in some levels that solve the problem but do not display the "Complete" message. In fact, in the rules of Hashi, all squares need to be connected. You can reach any other square from every square through several lines (in graph theory, it is called connected-graph). When all squares are green, but there is no "complete" message, there maybe are multiple unconnected areas. In this update, if this situation exists, a message will be displayed to prompt you to find places that do not meet the puzzle rules.