There is a total of 5 steel boxes. I've placed the 3 boulders and 3 of the steel boxes over the six buttons to turn off gates. I BELIEVE I now need 4 steel boxes to go over the lava and exit. Have used the 2 free boxes but now must remove 2 boxes that are covering buttons. I have to approach them from the back and that requires I go through the gates they have opened, approach the boxes from behind and step on a moving conveyor belt right behind each box. Once I remove any box it's gate closes and I can't get back around to get the last box.
Am assuming I am doing something wrong and there is another way to exit the level that I am not seeing. We have been working on this for days and can't figure it out!!! Help please.
You're welcome! And please don't worry. I think it happens to everyone, that they are solving difficult puzzles, but missing one little thing. At least it happened to me several times.