Your task in the game is to remove all the nodes with number. Link the nodes with the same number to make them disappear. If the number of each node is different, or you can't find any pair of node to erase, just draw a line between two nodes to reduce their number and find out new links. Sometimes it really tests your logical thinking.
You have 60 seconds and 15 levels to complete the task. Can you complete all levels within the time limit?
To connect nodes, just draw a line from one node to another. To delete link just draw a line crossing that link.