A "hands-on+brainpower" integrated desktop toy designed specifically for children aged 3-7 years old. Through a three-step closed loop of "color recognition → logical pairing → instant feedback", it allows children to complete a "micro training" of concentration and color cognition within 10 minutes. Built in CMOS color sensor, capable of recognizing 256 levels of RGB values and rejecting false alarms of "approximate colors". Real time correct or incorrect feedback, correct answer: rainbow light effect+fun sound effects; Wrong answer: Soft red flashing+prompt sound, does not undermine confidence. Solid color card+light guidance, no LCD/OLED throughout the process, passed the EU EN71 photobiological safety test. 15 minutes after dinner, have a parent-child battle to see who completes the 8-color gradient sorting first.