It gives points, and it helps you to finish the quest with sandy(the one that makes you play two people in one game)
& the places where i know there's

is on the first level(the one with the well), you go on the highest platform on the right and you jump on the one in the middle, there's a coin. When you are on the second level and you want to pass to the third, fall completly at the right and a coin will appear.

Chixxyjess
