It may be obvious that Starjack.io unblocked is a planet conquering game based on spatial strategies players to perform against rivals. Neutral planets are gray-colored those are easy to conquer. Just send more soldiers than the neutral planet has to conquer it in seconds. Moreover some of them are just empty and waiting for the attackers. Remember that the most important mission your colonies have is to make difficult to reach at your main base for enemies. Wait in lobby for your rivals to connect, meanwhile you may plan your strategy.