You've got to deal with the flashing orbs. AFAIR, there is a note about them in the house in one of the isles.How do i solve this?
You'll have to make them flash for all of them; or may be just for one row (I'm not sure). AFAIR, pressing one flashing orb on a row will flash the other one in the same row too (or something like that; make a few experiments).
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