Anthony Pratt filed a patent for a murder-mystery game on December 1, 1944, while World War II was still grinding on and Birmingham, England still went dark at night for air raids. He called it “Murder!” A British toy company later renamed it Cluedo, and it became one of the best-selling board games ever made, translated into dozens of languages and reprinted for generations of family game nights. Pratt sold off the international rights within a decade of inventing it, took a quiet civil-service and retail career afterward, and spent the rest of his life almost entirely unrecognized for what he’d built.

A Pianist Turned Factory Worker

Before the war, Pratt made his living as a pianist, playing at country hotels and on cruise ships, according to Wikipedia’s sourced biography of Anthony E. Pratt. Wartime work moved him into a Birmingham engineering factory manufacturing tank components. He had grown up on detective fiction, citing Raymond Chandler and Agatha Christie as influences, and he had also spent time at country-house parties where guests played after-dinner murder-mystery games, an entertainment format that directly shaped what he built next.

Designed at Home During Blackouts

Pratt and his wife, Elva, worked out the game’s concept together at their home at 9 Stanley Road in the Kings Heath area of Birmingham, sketching rooms, weapons and suspects to pass the long hours of enforced wartime darkness, according to the same Wikipedia account. He filed his patent application on December 1, 1944, and it was granted as patent GB586817 on April 1, 1947. A friend introduced him to Norman Watson of the game company Waddingtons, who saw a demonstration of the game in February 1945 and renamed it Cluedo, blending “clue” with “ludo,” the Latin word for “I play.” Production finally began in 1949, once postwar paper and material shortages eased enough to manufacture it at scale.

The finished set held onto Pratt’s original design almost entirely: six suspects — Miss Scarlett, Colonel Mustard, Mrs. White, Reverend Green, Mrs. Peacock and Professor Plum — moved through a nine-room mansion armed with a candlestick, dagger, lead pipe, revolver, rope or spanner, according to Wikipedia’s history of the game. Waddingtons’ American licensing partner, Parker Brothers, brought the game to the United States as Clue the following year, giving Pratt’s wartime sketch a second national market almost immediately.

He Cashed Out Early

In 1953, with the game selling well in Britain, Pratt sold the international rights for £5,000 — worth roughly £121,000 in today’s money — while keeping UK royalties until his patent expired in 1967, per Wikipedia’s sourced account. That single sale effectively capped what he would ever earn from a game that went on to sell in more than 40 countries over the following decades. After the deal, Pratt used the money to buy a sweets and tobacco shop in Warwickshire, later worked for three years as a solicitor’s clerk in Bournemouth, and retired around 1962 at 59 years old.

A Return to Anonymity

Pratt moved back to Birmingham in 1980 and lived out his remaining years there, largely out of public view, as Cluedo kept selling around the world under other people’s ownership. He developed Alzheimer’s disease before he died on April 9, 1994, at age 90. Recognition came only after his death: a blue plaque went up at his old Stanley Road address in 2013, nearly two decades after he’d passed, marking the house as Cluedo’s birthplace. In November 2025, his daughter donated his correspondence and personal memorabilia to the Birmingham Archives, according to Wikipedia’s account of the donation — the first substantial public archive of the man behind one of the most widely played games in the world.

A Game That Outgrew Its Inventor

Pratt’s arithmetic wasn’t unusual for its era — plenty of midcentury inventors sold outright rather than betting on royalties that might never arrive — but Cluedo’s scale made the gap between what he earned and what the game generated unusually stark. He designed something durable enough to survive translation into dozens of languages and nearly eight decades of new editions, then spent the back half of his life running a sweet shop and filing paperwork as a solicitor’s clerk, entirely apart from the thing he’d made.