You need to look for something suspicious... and stare at it... for a long time... although... I had 0 search and couldnt find it until someone else got their rogue elf searcher... but ya anyway, it's actually pretty easy to find, I found the spot they "
revealed" the door. The 2nd one isnt as hard in my opinion, but more confusing... LOL... it gets "better" after that. *smiles wickedly*