Each castaway must balance a small metal ball on a wooden cylinder, while holding the center cylinder in place with two wooden handles. Every five minutes, new pieces of the wooden rod will be added, making it harder to balance the ball on the center cylinder. The castaway who balances their ball the longest will win immunity.
The challenge debuted in Micronesia as the Final Immunity Challenge. Parvati Shallow dropped out of the challenge first. The remaining two castaways managed to remain in the challenge until the final round where Amanda Kimmel won the challenge after outlasting Cirie Fields.
In Philippines, the challenge was again used as the Final Immunity Challenge. In this season, an advantage was gained by Malcolm Freberg as a reward in the preceding challenge. The advantage allowed him to re-enter the challenge the first time his ball dropped. However, he was still the first contestant out of the challenge, with Michael Skupin ultimately winning immunity.
The challenge returned in Ghost Island as an Immunity Challenge. Prior to the challenge, Wendell Holland received the same advantage Malcolm Freberg had in Philippines from Ghost Island. However, he still failed to win the challenge, which ultimately came down to Domenick Abbate and Donathan Hurley, with Domenick outlasting Donathan to win immunity.
"Stir the Pot!"
"Million Dollar Question"
"A Giant Game of Bumper Cars"
- At the Survivor: Philippines Reunion, Malcolm Freberg referred to the first time the challenge was used in Micronesia by saying that Parvati Shallow won the challenge. He was wrong, as the challenge was actually won by Amanda Kimmel.
- Ghost Island is the first season wherein this challenge is not used as the Final Immunity Challenge.