Hi sorry for the late reply and thank you for trying out our Game!W ell the 3rd level is a huge spike in difficulty(I would suggest playing the 4th level before it). I should have made more mid difficulty levels. That level is basically a test of your ability to keep track of whats coming towards both cores . basically the idea is to have one source node pointed at one of the 2 diamond node clusters. and re orient the nodes in the diamonds as required. also you are limited in the number of lasers you can have in all the levels as indicated by the laser icon in the HUD (forgot to put this in the tutorial). Also you can lose the game in two ways letting 3 viruses(red) hit the cores or destroying 3 data packets (green). To win you need to get to the score indicated in the HUD for each level. Hope that answers your queries. Let me know if you have any more doubts