What the hell? There's no key, no 4-digit pin, just a scientific calculator keypad and some wierd hieroglyphics. Upon some further investigations, it turned out to be a mix of non-linear graphs and cosines (or whatever they call those things). You nearly panic after remembering your previous math exam results when you see a secondary school kid walking down the street with bulky glasses on their face and an advanced hieroglyphics - wait no - math text book in their hands.

Approach the kid           (new)

Go to your local school shop and find a scientific calculator