Deep, muddy field

This challenge is part of all the possible challenges in the Horse-ball competition.
Deep, muddy field
  When you create a horse-ball competition, you can choose from 6 different challenges and put one or more Deep, muddy field in your horse-ball competition.

Other available tests are:
· Clean field
· Deep, muddy field
· Green field
· Green, mowed field
· Muddy field
· Perfect field