You’ve got eagle eyes if you can track down the 10 blueberries hidden in this image – within two minutes. Innocent Drinks shared the brainteaser as it launches its new “focus-enhancing” Blueberry Super Smoothie, challenging fans to hide the fruits scattered across the park.

This one is particularly tricky as various objects match the hue of the blueberries, which are hidden amid a busy scene of people coming and going.

Brainteaser masters use various techniques to make chin-scratchers like…