Door Knocker is the first obstacle of the Qualifier. It has 3 doors to guess and it is first premiered in the Hotties vs. Nerds 4.0 episode. They have 300 pound door punchers only in doors 1, and 3. The door 2 is the succession of these.
- The Door Knocker is featuring the pie as the 1st, and chocolate cake as the 2nd.
- In Season 7 Episode 2, The 3 contestants play a competition game called "Don't Open That Door!". They wiped out for choosing the wrong door.
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