A mobile device with color discrimination for producing one of a plurality of pre-determined physical actions when disposed on an action surface includes a body having a set of wheels and a third point of contact with the action surface; means for executing a physical action; a color detection module including a broad spectrum illumination source with a source lens, the illumination source for producing a spot of light on the action surface; a photodetector with a bandpass filter, the photodetector for receiving light reflected from the spot of light and passed through the bandpass filter; a second photodetector with a second bandpass filter, the second photodetector for receiving light reflected from the spot of light and passed through the second bandpass filter; an electronics module including comparator circuits in electronic communication with the photodetectors; and a microcircuit in electronic communication with the comparator circuits and with the means for executing a physical action.