Jason Sheldon Zimmerman[1] (born February 5, 1989), known by his gamertag Mew2King, commonly shortened to M2K, is an American former professional Super Smash Bros. player from Cinnaminson, New Jersey.

Zimmerman is one of the "Five Gods" of Melee, along with Juan "Hungrybox" Debiedma, Adam "Armada" Lindgren, Kevin "PPMD" Nanney, and Joseph "Mang0" Marquez and is also widely considered one of the greatest Super Smash Bros. Brawl players of all time.

He uses his namesake character Mewtwo, as well as Fox and Mario, in Project M and specializes as Kirby in the original Super Smash Bros. game.

Zimmerman is known for his extremely methodical and logical style of play, as well as his detailed knowledge of frame data in Melee, earning him the nickname The Robot.

[12][13] The ban came after ADHD had stated that he paid Zimmerman US$300 to lose the loser's bracket final, a violation of MLG rules.

[15] In 2014, Zimmerman lost to aMSa in winners quarters and Armada in losers finals at Kings of Cali 4.

[17] After a complex leveling game, Juan "Hungrybox" Debiedma defeated Zimmerman at Paragon Orlando 2015.

[18] From 2009 to 2014, Zimmerman was a member of Empire Arcadia (EMP), a company that has also sponsored e-sports players such as Justin Wong.

On August 31, he defeated Leffen in the grand finals of PAX Prime 2015, thereby ending the streak of Swedish players winning national tournaments.

[30] On February 4, 2024, Zimmerman explained in a video on his YouTube channel why he had been absent from competing, citing toxicity in the Melee community.

Zimmerman is a full-time video game player who streams on Twitch[40] and attends tournaments almost every week.

[42][43] A 2009 photo of Zimmerman getting kissed by a girl at a Super Smash Bros. tournament has become a widely circulated viral image across the internet, including an article written on the subject by ESPN.