Build a box that only you know how to open and is safe from hackers.
Build a 3-D object out of tetrahedra that is as big as you are.
Use a microcontroller, motors, and mechanisms to make a robot that moves like a living creature!
Make a bubble maze that allows bubbles to move through a series of “on” and “off” switches.
Create a ball that is as round as possible using simple geometric shapes cut out of paper and taped together.