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(Image: SUCKITUPBUTTERCUPLOL/REDDIT)

When a puzzle fan posted her amazing achievement on social media, people quickly pointed out it was an unfinished job.

The mum spent a year completing the giant 18,000-piece puzzle, which was an image of a tropical island at sunset.

The Reddit user, under the name Suckitupbuttercuplol, wrote: “A year and 18,000 pieces later…”

But can you spot the missing piece?

One social media user zoomed in on a tiny blank space – which was next to the woman.

One wrote: “There really is a piece missing... On the left half way up the building.”

While a second added: “17,999, a year and still not finished.”

And a third joked: “She moves out of the way and there is a her-shaped silhouette missing from the puzzle.”

(Image: SUCKITUPBUTTERCUPLOL/REDDIT)

She then explained that her son had eaten the missing piece, which was meant for the slot above her right arm.

Other Reddit users helpfully suggested she could buy the puzzle again.

Meanwhile, this isn’t the first time something has gone viral on Reddit.

Previously, a picture of a man and woman hugging baffled the internet – can you see why?

And how dirty is your mind? This rude optical illusion has left everyone in stitches.

While Reddit users were left outraged by this man’s breakfast – can you see what’s wrong with it?