Meteoria: Home of the Turrets

You are going to Meteoria, a small cluster of meteors guarded by automated turrets and sentries. Your mission is to find the control center and disarm the turrets with an access code. To do this, you need to find a portal that will transport you between three meteors. On each of those meteors, there is a white X you must find that gives you clues to the code. Once you have the complete code, you need to get to the heavily guarded, red-beacon meteor that houses the control center.