Painajainen

Water entrance puzzle:
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Although most puzzles are pretty straightforward, there is an
entrance to the right you cannot pass through because of water
pouring down the ceiling. It somewhat confusing because certain
techniques allow you to get through quite far, only to be pushed
back again eventually. The trick is to go one screen up, where 
there's water spraying from the ground. Move up one more screen
and push the block to the right, down the platform. It will block
the source and you can pass through the entrance right away.