They can be entertaining and infuriating in equal measure. Optical illusions and brainteasers are a fantastic way to keep your mind sharp and can be fun for all the family to get involved with.
Many people find as they continue to challenge themselves, they can become easier to do, The Mirror reports. Freshers Live has produced a new brainteaser that demands you find the number 324 hidden in a sea of 374s.
But there is a catch - you have to complete it in 20 seconds. Take a look at the image below and try to locate the 324. It's difficult, but it can be done.
