These toys were an absolute BITCH to play with. They could give anyone blisters from all the connecting and disconnecting. For some reason, their color-coded connectors gave you some clue about how much pressure you had to apply to get the rods in. The orange connectors never seemed to have any real purpose other than to annoy you by being there. There were also wheels and gears, but being only 8 years old, I really didn't understand the general mechanics of gears and how higher RPM by gears could actually help me in the long run with the motors.

They are plenty more fun once you break out the rubber bands, duct tape, and assorted Lego pieces. The ultimate of geek toys.