The Sonic Black Hole Coin Bank is a great project for boys and girls age four and up. This bank is a fun project to build and an entertaining way for kids to save money. The bank is operated by loading a coin on the coin guide and giving it a quick push with your finger. Just like the large coin funnels you might see in a mall, the coin spins around inside the funnel picking up speed as it spirals down, eventually dropping into the bank below.
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