Jumping puzzle

'''As of 1.0, the jumping puzzle will no longer unlock the nimble background. It is unknown whether another reward will be added in the future.'''

The jumping puzzle can be found on the character selection menu. Solving it will unlock the nimble background. After many tries at it, the time showing how close you were to the right jumping timing will be shown above your character, the smaller the number, the better.

Tips
Using the walk button to get closer to the edge without risking falling will prevent a lot of frustration. The timing seems to work best when you walk until you are pretty close but not under 5.0 from the edge, then taking a running start before jumping. There are platforms to help you get back up easily.