1.Matchmaking rule: Select two similar icons. If the number of straight lines connecting these two icons is less than 3 and they don’t touch other icons, clear two icons connected.
2.Operating rule: In the game, once you select an icon within current level for the first time, the icon will be marked as Selected. Select the other icon. If this icon is the same as that selected one and they meet the connecting rule, clear this pair of icons. Otherwise, the first icon will restore to its unselected status and the second icon will become its selected status.