I'm on the level with the equation hint. I found the wood, and found how to reach the forge with the wood, but I can't find any ore to make a pickaxe. I've tried everything and looked everywhere. I assume the big room is a trap, since none of the holes there work. Any hints, please?
AHA the problem was that I didn't see the levers. The coloration did look a bit odd to me, and I was pressing E all along that wall, but I didn't see any change or realize they were levers to push/pull in a pattern. It would be much better if, e.g. there was red at the tips of the handles. But thank you, that worked!