You don't or you can't
it depends on the dungeon your talking about on poptropica. sure, there is probably one dungeon on poptropica but you still need to be specific
its in the dungeon.
In the dungeon
in the dungeon
under the library in the castle
go into the dungeon
if you do not give the mouse to the owl then you will not complete the island or get back in the dungeon
With the robot in the dungeon
just type in "HOW TO BEAT ASTRO KNIGHTS IN POPTROPICA" in the 'enter a Q or phrase...'!
in the dungeon. use the owl to get it
turn all the cards to the to by clicking on them
Get the cheese from the dungeon and use it on the mouse