Brainteasers can come in many different shapes and sizes. Traditionally there are three main types, observational, analytical, and mathematical.

Mathematical brainteasers ask users to solve a maths puzzle as quickly as they can whilst analytical brainteasers require them to solve a riddle.

Observational brainteasers, like the one above created by The Post, require someone to spot the anomalies or anomalies within an image.

On this occasion, the image above is an optical illusion which appears…