Boats, Brains, And Brawn (Episode 8, "You Call, We'll Haul")
This Reward Challenge was first executed in the beautiful blue waters of the Philippines. However, in Cambodia, the crew added the "color cube" puzzle at the end, which offered both a good tabletop brainteaser and a physically challenging element. (Each of those wooden crates weighed 70 pounds!)
Originally, the metal frame—which took the pyrotechnics department two weeks to construct—rotated, but they decided to keep it static so it was safer for the players to climb.