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A guy spent 3,400 hours over the course of three years to beat each and every title in the NES video game library.
Piotr Delgado Kusielczuk – who goes by the name "The Mexican Runner" on Twitch – started on May 28, 2014 and finished up just about a week ago.
His first victory was the 1990 game Whomp 'Em, which Piotr finished in two hours and 11 minutes. He crossed the finish line with Super Mario Bros. 3, which he beat in an hour and 43 minutes. (Mental Floss)