Mother of All Invention

The downloadable 60-page guidebook instructs on how to build 16 inventions from the 13 bits and 56 accessories, which include a power supply, servo and fan. After learning the basics, there's no telling what your kid's imagination will create. At best, a personal cold fusion reactor; at worst they're not playing video games.  You can also pick up a Droid Inventor Kit ($100) to build your own force (motion)- controlled R2D2 (Ages 8-12)