If you get stuck check out if you have achieved following things.
4 hints available
Have you looked at the lamp in the museum?
Did you talk to the genie ( In front of room 3 )
and ask how to get him home? Did you take a spirit quest after that?
In front of room 3
Stick the cosmic stamps into the lamp. Did you find Otto after that? ( He is in room 3. Look into the window. ) Make him lose all three wishes.
He is in room 3. Look into the window.
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