This logic game is a bit on the hard side; especially as you get past the few introductory levels. The objective for each level is simple: charge up every white node by making the proper connections. Making connections can be done in 3 basic steps: 1) click your mouse on the node you want to use 2) While still holding the mouse button, aim towards the node you wish to connect with 3) release the mouse button to attempt connection.
Note that each node can have only 1 inbound and 1 outbound connection.
As levels advance, new types of nodes get introduced.