Piotr Delgado Kusielczuk, better known as The Mexican Runner or TMR, is a speedrunner who specialises in Nintendo Entertainment System (NES) games. After three years, on February 26, 2017, TMR was the first player to play through the entire NTSC and PAL NES catalogue, completing 714 officially-licensed titles in a project he called NESMania, which earned him a Guinness World Record. TMR is also known for his speedrunning accomplishments in Contra, Battletoads, and Cuphead. Early life The Mexican Runner was born to a Mexican father and Polish mother. He grew up in Xalapa, Veracruz, Mexico. Career beginnings The Mexican Runner began performing NES speedruns on the Twitch streaming platform on January 3, 2013. Occasionally, his brother Marek (dubbed The Mexican Brother) would also participate in the streams. Together they recorded a two-player Battletoads completion clocking at 38:44. NESMania In 2014, The Mexican Runner's mother's health started to suffer as she developed kidney cysts. TMR moved from London to Mexico to take care of her. While speaking online with fellow speedrunners from Chile about the stressful situation regarding his mother's health, they sarcastically suggested that he should play the entire NES library. He decided it was a good idea, and on May 28, 2014, he started streaming a complete playthrough of the entire licensed NES library, beginning with Whomp 'Em. The playthrough was coordinated with a Google spreadsheet and archived as YouTube videos. ТMR named the project NESMania, in honour of Nintendomanía, a 1990s Mexican TV show centred on video games. The original self-imposed rules were that he would play each game without consulting online strategy guides nor accept help from others for completing the game. The only allowed outside information was the original game manuals. The criterion for when a game was completed depended on the nature of the game, as many of the original NES games had no clear winning conditions and can be played indefinitely for higher scores. If the game had a clear ending sequence or ending credits, that was the winning condition. Otherwise, TMR would play a game until the game repeated itself or no further progress could be made. In one instance, when playing the Elite port to the NES, a member of the online audience contacted Ian Bell who suggested a winning condition. TMR wrote, At first glance this game looks like doesn't have an ending screen and surely doesn't so we had to