This map is a dropper minigame where the objective is to land safely in the water but most of the way down there will be obstacles blocking the way. It gets gradually more difficult as you make your way through the levels. Right now there are 16 different levels but more will be added in a future update.
You complete a level by dropping down to the bottom of the level without dying. This usually happens by falling into the water or bouncing on some slime blocks. Find the pressure plate and step on it to access the next level.