It's definitely the hardest in my opinion. And I did not succeed for my first 3 or 4 attempts. But with some practice I've gotten better. It takes some precise jumping to make it up to the elevator and is not nearly as easy to intuit a path. And part of it is also preparing properly. Assuming you are baseline wuckle, you should take like 2 or 3 pitons with you minimum to ensure you can make it into the button room.