Credit: Facebook / British Army in London

You’ve seen optical illusion paintings before, but a non-photoshopped optical illusion photograph? Mind-boggling. A puzzling image of 12 members of the U.K.’s Household Cavalry hiding in the Brunei jungle has the Internet completely stumped.

The photo, which was posted on the unit’s social media accounts, features a dozen soldiers camouflaged among the trees and leaves as part of their Close Target Reconnaissance training.

“The Cavalry are honing vital skills in the Brunei Jungle that could ultimately save lives on future operations.”

Can you find all 12 soldiers?

There’s one, behind that leaf. And another, behind that twig. Oh, wait, that’s a rock. There! behind that tree. Umm, maybe not.

Here, look again:

Credit: Facebook / British Army in London

The unit also uploaded an answer key, with each soldier circled in red.

Go to the next page when you’re ready to see the answers!

Here we go:

Confession: We did NOT find them all.

The Household Cavalry serve as the Queen’s official bodyguards and is part of the Household Division.

Notable members include Prince William, Duke of Cambridge and his brother Prince Harry. (Maybe you’ve heard of them?)