Only those with eyes like a hawk will spot the hidden number in just 9 seconds | Weird | News
One of the best things about brainteasers is their variety, their colour, and the different forms they can come in.
There are three main types of brainteaser, observational brainteasers, mathematical brainteasers, and analytical brainteasers.
Mathematical brainteasers pose a maths question to the user who then has to solve that problem as quickly as possible. Analytical brainteasers often pose a written riddle or other form of tongue twister that needs to be unravelled.