So you love watching Sumo robot competitions? The SumoBot WX Competition Kit comes with everything you need to build and program your own Sumo robots. They can be programmed using the BlocklyProp visual programming interface.
The SumoBot WX robots use a Propeller FLiP multicore microcontroller as their brain. They use infrared sensors in front and on the sides to detect opponents. You can extend their capabilities with an accelerometer, distance sensor, or WiFi module.