Walk Like A Big Loser

This is the 4th episode of Survivor: Sri Lanka

Challenges
Reward Challenge: Basket Brawl Three castaways from each tribe would face off against each other in a partially submerged field of water to retrieve a ball. They must then throw the ball into their tribe's respective net to score a point. The first tribe to score three points would win. Winner: ?

Immunity Challenge: Floating Puzzle The tribes will race through an obstacle course with their carts. They will climb various ladders, retrieving keys. Those keys unlock a chest. They put the chest on their cart and make their way through the obstacle course to a wall. When they get to the wall, they disassemble the cart. They pass the cart and the chest and everything through the wall. They reassemble it all, make it to the end, where 2 players will assemble the puzzle. Winner: ?