Two paper robots, Orange and Blue and two Fizzbits. Build the robots, attach the Fizzbits, charge for 30 seconds in USB and you have a three moving robots. If you get bored of your robots just remove the Fizzbits and make new robots, either by downloading and printing out designs from the website or inventing your own.

Puzzle - Building Wooden Robots with Interchangeable Parts for Family Bonding TimeTwo Crafty Robots
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