Ninja Kid 6 - The giant ninja

It's time again for the annual Halloween fair in Putdam. Unfortunately, Nelson and Kenny are still not tall enough to ride all the cool roller coasters. Maybe Grandma Jansje's latest invention can help them: a zapper that allows you to change the size of something. But when they use it, things go completely wrong; the boys are suddenly very small!
Now they are no longer allowed to enter anything and to make matters worse, the fair is also being attacked by gigantic robots! Will the boys be able to grow up again in time to defeat the robots?
The Giant Ninja is the sixth part of the cheerful and beautifully illustrated adventures of Ninja Kid and H-guest.