If you’re a regular Mental Floss reader, you know that we’re enormous fans of artist Gergely Dudás. For the past two years, the Hungarian illustrator (who is better known as “Dudolf”) has been taking the internet by storm with his hidden image illustrations, going back to the time he hid a single panda bear in a sea of snowmen in 2015. Today, no holiday would be complete without a classic Dudolf brainteaser, and he has delivered his latest one just in time for Halloween by drawing a ghost hidden among the hundreds of skeletons in the illustration above. Can you find it? Your time starts now …

If you’ve looked and looked and are truly stumped, you can find the solution by clicking this link.

Speaking of the holidays: the celebrated artist has recently released his first book, Bear's Merry Book of Hidden Things, which is full of holiday-themed hidden image illustrations that will keep you busy from Thanksgiving to New Year’s Eve.

To see more of Dudolf’s work, check out his blog or follow him on Facebook.