Grand Canyon Burst

Over the South Rim and down into the Grand Canyon: along the river between layered red walls, out over the rock on trestles and back in, round the horseshoe bend beneath a glass skywalk, to a camp of cabins at the water's edge.

• Series: Canyons
• Length: 1.3 km
• 20 marbles a race, about a minute; every race is free