Katrielle and the Millionaires' Conspiracy walkthrough
Puzzle Location: Tower Bridge (The window of the center in the bridge pillar)
The numbers from one to five have counted up the number of something about them.
'1' has one, '2' has one, '3' has zero, and '4' has three.
How many does '5' have?
The things that they counted has something to do with their appearance.
Colour is irrelevant.
Just think about the shape of the numbers.
Numbers are made up of straight lines and curvy lines.
Try counting up how many straight lines each number has.
The answer is '2'.