Brainteasers and other types of brain puzzles can come in many different shapes and sizes, but the three most common types are observational, analytical, and mathematical brainteasers.

Mathematical brainteasers pose a complex maths-based question which must be solved as quickly as possible. Meanwhile, analytical brainteasers come in the form of written riddles or tongue twisters which contain a hidden meaning.

Observational brainteasers, such as the one above from Online Games.io start with an…