The first portal that you get to leads to a cave with a series of boulders that you have to move onto green buttons in order to get the gates to retract. First one, no problem. The second boulder, however, is positioned against a wall. I can only move it up or down, but I can't get behind the boulder in order to push it away from the wall and towards the green button. Am I overlooking something or do I come back to this later?
Thanks!