The winning contestant is moved to the top-left zone and has 60 seconds to answer five "brain-teaser" questions correctly.
These usually consist of anagrams and jumbled words (unscrambling letters to form the answer based on clues given), math problems and general-knowledge questions.
The contestant with the highest score is granted immunity from the drop by coming to the center of the stage to pull the handle.
If there is a tie for the lead, the host pulls the lever, with all four contestants in danger of elimination.
If a drop zone lands on that contestant's spot, the trapdoor opens and they drop through the floor and are eliminated from the game.