Castaways must stack letter blocks on a wobbly platform to spell out designated words. When returning to their station to collect more blocks, they must first lock in their mechanism. If any blocks fall, they must lock in their mechanism before picking up the fallen blocks, return them to their station, and start over. The first castaway to correctly spell the designated words without any upside-down letters and lock in their mechanism wins.
The challenge was first used as the Final Immunity Challenge in Heroes vs. Healers vs. Hustlers, with the castaways having to spell out "Heroes", "Healers", and "Hustlers". Early on, Ben Driebergen placed all of his blocks on the platform and locked in his mechanism, but did not realize that he had an upside-down letter. The challenge came down to Ben and Chrissy Hofbeck, and when Ben's blocks fell while he attempted to lock in, Chrissy was able to swoop in and win her record-tying fourth immunity.
The challenge was again used as the Final Immunity Challenge in Island of the Idols, with the castaways having to spell out "Island of the Idols". In a neck and neck race to the finish between Dean Kowalski and Noura Salman, Dean's blocks fell, while Noura was able to finish spelling her words to win her third immunity.
|Heroes vs. Healers vs. Hustlers
"Million Dollar Night"
|Island of the Idols
"Mama, Look at Me Now"
- This challenge is named after the Muddy Waters song of the same name that was later popularized by Led Zeppelin.
- Only women have won this challenge.