Froggy World 1 The Catapult
by mrigsby, published
This is an amusement park for adventurous frogs. Each "ride" will be started by a signal from the previous ride--and will send a signal to tell the next ride that the frog has left.
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Full instructions are available at: http://www.instructables.com/id/Froggy-World-1-The-Catapult/