Jigsaw puzzle enthusiast John Philpot has dedicated months of his life to completing some of the biggest puzzles in the world and his passion boils down to three simple things: adrenaline, addiction and art.

Key points: The Prime Minister called jigsaw puzzles "essential", saying it's OK to leave the house to buy them

The Prime Minister called jigsaw puzzles "essential", saying it's OK to leave the house to buy them Jigsaw puzzle enthusiasts are not surprised the pastime is back in the spotlight

Jigsaw puzzle enthusiasts are not surprised the pastime is back in the spotlight Retailers say they are responding to "unprecedented" demand for jigsaw puzzles

"It's a thing of beauty to look at," he said.

"Then, as you get to bigger and bigger jigsaw puzzles, there's the challenge of actually assembling all the pieces, which gets more and more difficult.

"You wake up in the morning and wonder, 'how many pieces will I get through today?'

"It gets your adrenaline going if you're really into it."

A few years ago the retired GP from Warrnambool, in south-west Victoria, finished a 33,600-piece puzzle with his son, Ben, that was one of the largest in the world.

Dr Philpot's son Ben with the 33,600-piece jigsaw puzzle they worked on together. ( Supplied: Ben Philpot )

PM: jigsaw puzzles an 'essential' item

Prime Minister Scott Morrison raised eyebrows over the weekend when he described jigsaw puzzles as an "essential" item, telling Australians it was OK to leave the house to buy them during the coronavirus pandemic.

But Dr Philpot is not surprised jigsaw puzzles are back in the spotlight with so many people staying home.

John Philpot is currently working on a 9,000-piece jigsaw. ( ABC South West Victoria: Sian Johnson )

"You can feel it, you can touch it," he said.

"Why did people go back to record discs when they had CDs?

"The new technology comes along but there's this hankering for the old stuff.

"Jigsaw puzzles will always be around and the popularity will just go up and down."

Passion for puzzles started in the 1950s

The first jigsaw puzzle Dr Philpot finished was one featuring Edinburgh Castle that his sister brought back from a trip to England in 1956.

"I must have done that tens of times until the pieces started going missing," he said.

"I pretty well knew where every piece was in that puzzle."

Since that first foray into the world of puzzles, Dr Philpot has completed hundreds of them, most made up of thousands of pieces.

He has been working on a 9,000-piece puzzle while staying at home during the coronavirus crisis, in between sorting out his stamp collection, reading and playing chess online.

Dr Philpot said it was the "perfect thing" to work on while stuck at home to fill in the minutes and gaps in the days.

John Philpot with some of his puzzle collection. ( ABC South West Victoria: Sian Johnson )

"You can sit down for 10 minutes to do a jigsaw puzzle," he said.

"Of course, when you get really addicted, the jigsaw puzzle becomes the thing you do most of all."

Retailers rush to meet 'unprecedented' demand

Jackson Heenan, stock controller at Mind Games Melbourne and online game retailer Gumnut.io, said jigsaw puzzles had been flying off the shelves for weeks.

The Philpot family love a good jigsaw. ( ABC South West Victoria: Sian Johnson )

"I think, for the most part, the customers beat the Prime Minister to it," he said.

"We've been selling huge numbers of them in the last two weeks.

"People are realising they're going to need to stay home for a while and need something to keep them busy."

Even an 18,000-piece Sistine Chapel jigsaw puzzle, which retails for about $350 and had been sitting in the shop for two years, sold in the past fortnight.

Although the number of in-store customers had declined, Mr Heenan said online sales had exploded.

"We're just pushing out so many parcels every day, and they're mostly jigsaws."

"It's definitely of an unprecedented time."