Single Roller
Single roller writing

In "Single Roller" a big cylinder is laid on a metal track, above the water. The contestant has to stand on top and move it along the rails to the end. 

The track ramps slightly downhill, it then flattens off towards the middle before turning into a steeper slope near the end, so the contestant needs excellent balance to stay on top as the cylinder rolls down. 

If the contestant manages to stay on the cylinder to the end of the track, they can leap off onto the finishing platform and have won the game; but if they fall off at any time they lose.