There is neither a puzzle, nor a challenge associated with the gate, you can simply walk behind it?
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Alright I will admit it's been about 20 years since I played a point and click game so I am a little rusty once i dusted the cobwebs off and made it past the gate i was able to find my way to the attic after walking past it for about 10 minutes because i could not see it clearly very nicely done I like it