Puzzle Room List

 Every answer in the list is something often seen in a puzzle room. Name these things from their anagrams minus one letter.  Unscramble the letters in the boxes for the final answer.  

In and Out Box

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Input a positive number in the box below and it will yield a result. Keep inputing different numbers until you figure out the pattern. The result of the number 427 can be used as a promo code for 10% off a puzzle room experience.  The code is valid until March 1, 2020.