Sometimes it's hard to see the wood for the trees — but in the case of this optical illusion, it's a single leaf that's proving elusive.

Released to mark Earth Day this weekend, the puzzle challenges eagle-eyed players to spot the oddly shaped leaf in the tree's bright green foliage.

Its creators at switchmybusiness.com say they included one leaf shaped like a "foot" in the "ocean" of leaves on its branches, to highlight how important it is to be aware of the footprint we leave on planet Earth.

So can you spot it?

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Were you able to spot the single rogue shape among the identical leaves?

It has been circled in white below if you're still struggling.