Hyperion was insane. So much goddamn armor.
Still didn't stop me from killing him my first try without taking damage or using bombs. After destroying all his armor the difficulty decreased a lot.
Stage 4 has you controlling the elephant by moving it with the mouse. If you keep holding the mouse button without letting go it works for the rest of the stages.
To the people complaining about the sound. In the options click on the left border of the sound and bgm bars to lower it completely. Also if you pause any moment you're doing a puzzle the menu has two buttons that turn the sound and bgm on and off.
In the last level, has anyone been able to assemble the stairs to reach that other portal way up above the "washing machine" door? I've been able to get within two squares of it by grabbing a stairwell, going back down until I'm on the ledge above the level with the washing machine, and then leaning around the corner to place it. I've got all four sets of stairs to play with, but I can't place the last couple to reach the portal.