This robot uses the mechanism: Then it will add all number from one to this number if the number fits in the regulations. Like this: If input is 10 Add numbers 1+2+3+4+5.... until 10. The output will be 55 Also, click the "a" , "s" , "w" , and "d" to switch between the voice of the robot. Exclusive: Press space to hear a kitten speak. You have to press one of these keys before you hit the green flag if you want to hear a special voice.