Word: sudoku
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Dates: during 2010-2019
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...initial shock of the rule change has since worn off. "I've had [Scrabble] tournament directors calling me to say they haven't ever had so much interest," Chew says. "There's an understanding now that the publicity is good." (Watch TIME's video "Inside the Mind of a Sudoku Master...
...Sudoku Puzzles All you need to solve these number games is logic and a pencil. But since brain training requires both persistence and novelty, be sure to keep at it and also vary your regimen...
Memory-enhancing offerings range from Dakim's $2,300 touchscreen cognitive-fitness machine, used in more than 300 senior-living facilities in the U.S., to Nintendo's $20 Brain Age, whose two versions have been purchased by millions of gamers looking to do such things as play sudoku or simultaneously count people entering and leaving a house. Allstate launched a pilot program in 2008 that gave 100,000 customers software designed to improve their reaction time behind the wheel. And American Airlines offered a free memory game in an online promo in December...