Circuitmess Sparkly Instructions Manual page 43

You'll use these potentiometers to decrease or increase
the sensitivity of photoresistors in order to adjust Sparkly's
sensitivity depending on the lighting in the room. You
can turn the potentiometers using the screwdriver.
Potentiometers
Place your Wacky
Robots on Sparkly,
turn it on, and
watch it drive
towards the light.
*Wacky Robots are sold separately