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Tough Mudder is an event series that challenges teams of participants to overcome 10-12 mile long muddy obstacle courses. The series included 35 events in the US, Canada, UK, and Australia in 2012 and 60 events are planned for 2013. More than 500,000 participants worldwide took part in Tough Mudder events in 2012, raising $3.5 million for the Wounded Warrior Project in the process.
Tough Mudder was co-founded in 2010 by Will Dean and Guy Livingstone, both British. With $20,000 of seed capital, Dean and Livingstone launched the first Tough Mudder event, held on May 2, 2010 at Bear Creek Ski Resort near Allentown, PA. The pair hoped for 500 participants, but ultimately sold more than 4,500 tickets to the event while also raising more than $200,000 for their official charity partner, the Wounded Warrior Project. Inspired by the success of their first event, Tough Mudder LLC went on to host two additional 2010 events in Northern California and New Jersey, followed by 14 events in 2011 in other US states. The company plans to host more than 60 events worldwide in 2013, including expansion into Germany. 
Tough Mudder partners with charities around the world that focus on support for veterans returning from the battlefield. Within the company's first two years, Tough Mudder participants have raised more than $3.5 million.
World’s Toughest Mudder is the final event of each Tough Mudder series calendar year. Different from traditional Tough Mudder events, World's Toughest Mudder is a 24-hour race designed to find the toughest man, woman, and four-person team. Participants must qualify for the event by completing a regular Tough Mudder event during the year and submitting an application for entry. World's Toughest Mudder 2012 will be held at Raceway Park in Englishtown, NJ on November 17th and 18th.