The Mindstorms EV3 kit only comes with printed instructions to build a basic robot, the TRACK3R. However, those instructions have something much more important: the size chart.

We try building our first Lego Mindstorms EV3 robot, and make some decent headway.

The EV3 instructions start simply: they guide you through the building of the first robot, the TRACK3R, a tank-like vehicle with a spinning claw. It takes about an hour and, once you're done, you ...

Lego Mindstorms says the robots' modular designs can enable a youngster to build and program a robot in as little as 20 minutes.