By the Numbers

 is a recurring challenge in Survivor.

Rules
The tribes a lined up on a very narrow balance beam. One tribe member at a time, they must move across the beam and around the other tribe members. The person crossing can only touch one member at a time. If they touch two people at once or fall into the water, they must start all over. Once a member reaches the platform, the next person goes. The tribe who gets all their members across first wins.

History
The challenge was first used in, for reward. The Yasur tribe was easily able to win the challenge for reward in the form of blankets and pillows.

In, Moto and Ravu competed in this challenge for reward. Moto developed a strategy which involved having the member kneel down, allowing them to cross with relative ease. This would allow Moto to easily win and earn fish, rice, spices, and a king-sized bed with sheets, pillows and blankets. This is the only season where the challenge was administered to tribes with both male and female members.

The next time the challenge was used was in for immunity. While the Manono tribe made decent progress, the Salani tribe had communication problems early on, made worse by Kat Edorsson unnecessarily jumping into the water. By the time Monica Culpepper was able to come up with a plan to get the women across, the Manono tribe won immunity.

Trivia

 * This challenge is mostly used in Battle of the Sexes format seasons.