The goal of the game is to put the nodes in order. Future levels will remove some of the information from the nodes, and users will have to interpolate the locations without all the information about the nodes.
The nodes are represented by the containers with a bug image in them. In an actual node, the data inside isn't the address, or location in the list. For visual representation though, I've addressed the nodes with the color of the bug.
Each node has a previous: the node that came before it, and a next: the node that comes after it. A node that starts the list, or head, will have no previous link to a node it will say: None. A node that ends the list will have no next link to a node, so that will be labeled: None.
To finish early to get a better time score, press the DUMP button to see if your list is correct. The timer will stop early if you press the DUMP button, but you can't change any more nodes.