NXT version of the LEGO Mindstorms robots have a sound sensor. It can detect ... sound. You can make the robot do things when you clap, move, or just when you are silent.
This is a category only with mobile robots bases that you could directly build and use for competitions, classes or learning at home.
A category with the box robots resources for all the different competitions. The idea of a box robot is to use it as a Base Chassis on which to extend with additional attachments.
Robotics tutorials connected with the VEX robotics sets. Both VEX EDR and VEX IQ. The sets are a little more complicated that the LEGO sets and offer many opportunities for new STEM challenges and for new more integrated approaches to learning STEM.