Froggy World is an amusement park for adventurous frogs.
This ride is the first in a series. Each ride receives a signal from the previous ride "You've got the frog;" and each ride signals the next that "Frog has left, you've got the frog." Eventually, the frog will be returned to the catapult (by another ride) and the cycle will repeat.
The concept for winding and releasing the catapult spring comes from Arduino Controlled Catapult by UnusualTravis