The boss is hiding in the Boss Room, and won't reveal itself until you do something.
- Note that you can go to back to the main page, but attempting to do so will initiate a cutscene in which That One Boss drops from the ceiling.
http://tvtropes.org/pmwiki/pmwiki.php/Laconic/HeWasRightThereAllAlong
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The boss is hiding in the Boss Room, and won't reveal itself until you do something.