User blog comment:Olaf-Tiffi-Odus2711/Olaf's Look a like level contest/@comment-12690164-20141129105808/@comment-30095342-20141129113021

The keys and chests don't quite work like that.

One key will remove a layer of every chest on the board (or remove them entirely, if they only have one layer like here)

Don't worry, you're not the first to assume this, and you'll almost certainly not be the last. I'm just giving you a heads up for next time. :)