Major League Baseball (MLB) is a professional baseball organization that constitutes one of the four major professional sports leagues in North America. MLB teams play in the American League (AL) and National League (NL), which operated as separate legal entities from 1901 and 1876 respectively. In 2000, the leagues merged into a single organization led by the Commissioner of Baseball. The organization oversees minor league baseball leagues, which operate about 240 teams affiliated with the major-league clubs. With the International Baseball Federation, the league also manages the international World Baseball Classic tournament. Baseball's first professional team was founded in Cincinnati in 1869. The first few decades of professional baseball were characterized by rivalries between leagues and by players who often jumped from one team or league to another. The period before 1920 in baseball was known as the dead-ball era; players rarely hit home runs during this time. Baseball survived a game-throwing incident known as the Black Sox Scandal in the 1919 World Series. Baseball rose in popularity in the 1920s, and survived potential downturns during the Great Depression and World War II. Shortly after the war, baseball's color barrier was broken by Jackie Robinson. The 1950s and 1960s were a time of expansion for the AL and NL, then new stadiums and artificial turf surfaces began to change the game in the 1970s and 1980s. Home runs dominated the game during the 1990s, and media reports began to discuss the use of anabolic steroids among MLB players in the mid-2000s. In 2006, an investigation produced the Mitchell Report, which implicated many MLB players in the use of performance-enhancing substances, including at least one player from each MLB team. Today, MLB is composed of thirty teams: twenty-nine in the United States and one in Canada. Teams in MLB play 162 games each season. Five teams in each league advance to a four-round postseason tournament that culminates in the World Series, a best-of-seven championship series between the two league champions that dates to 1903. Baseball broadcasts are aired throughout North America and in several other countries throughout the world. Games are aired on television, radio, and the internet. MLB has the highest season attendance of any sports league in the world with more than 74 million spectators in 2013.

Maniac Mansion is a 1987 graphic adventure game developed and published by Lucasfilm Games. Initially released for the Commodore 64 and Apple II, it was Lucasfilm's foray into video game publishing. The game follows teenager Dave Miller as he ventures into a mansion and attempts to rescue his girlfriend from an evil mad scientist, whose family has been controlled by a sentient meteor that crashed near the mansion 20 years earlier. The player uses a point-and-click interface to guide Dave and two of his friends through the mansion while avoiding its dangerous inhabitants and solving puzzles. The game was conceived in 1985 by Ron Gilbert and Gary Winnick. They based the story on horror film and B movie clichés with humorous elements, and they based the game's characters on people they knew and characters from movies, comics, and horror magazines. The developers based the mansion's design on the Main House at Skywalker Ranch, outlining the map and pathways prior to programming. The interface came from the designers' desire to improve on contemporary text parser-based graphical adventure games seen in earlier adventure titles. To reduce the effort required for creating the game, Gilbert implemented a game engine called SCUMM, which would be re-used for many other LucasArts titles. The game was ported to several other platforms; the Nintendo Entertainment System (NES) version had to be considerably modified to follow Nintendo of America's content policies, which barred material deemed inappropriate for children. Regarded as a seminal adventure title, Maniac Mansion was critically acclaimed; reviewers lauded its graphics, cutscenes, animation, and humor. Reviewers and other developers have considered its point-and-click interface revolutionary; the system has led competitors to adopt similar interfaces. The game influenced numerous other titles, has been placed in several "hall of fame" lists, and has led fans to create remakes with enhanced visuals. A TV series, written by Eugene Levy and starring Joe Flaherty, was created in 1990 and lasted for three seasons, filming 66 episodes. Lucasfilm Games released the sequel Day of the Tentacle in 1993, which also received critical acclaim.

Mappy Kids (マッピーキッズ, Mappī Kizzu) is a video game console-only sequel to the 1983 Namco/Midway arcade game Mappy. This game was released for the Family Computer in Japan only.

Mappy-Land (マッピーランド, Mappī Rando?) is a video game console-only sequel to the 1983 Namco/Midway arcade game Mappy. The game was developed by TOSE and published by Namco in Japan and Taxan in North America for the Nintendo Entertainment System. There are eight themed lands in this game.

Mario Bros. (マリオブラザーズ, Mario Burazāzu?) is a platform game published and developed for arcades by Nintendo in 1983. It was created by Shigeru Miyamoto. It has been featured as a minigame in the Super Mario Advance series and numerous other games. Mario Bros. has been re-released for the Wii's, Nintendo 3DS's, and Wii U's Virtual Console services in Japan, North America, Europe and Australia. In the game, Mario is portrayed as an Italian-American plumber who, along with his younger brother Luigi, has to defeat creatures that have been coming from the sewers below New York City. The gameplay focuses on Mario's extermination of them by flipping them on their backs and kicking them away. The original versions of Mario Bros.—the arcade version and the Family Computer/Nintendo Entertainment System (FC/NES) version—were received positively by critics.

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Mario (Japanese: マリオ, Hepburn: Mario?) is a fictional character in the Mario video game franchise by Nintendo, created by Japanese video game designer Shigeru Miyamoto. Serving as Nintendo's mascot and the eponymous protagonist of the series, Mario has appeared in over 200 video games since his creation. Depicted as a short, pudgy, Italian plumber who resides in the Mushroom Kingdom, he repeatedly rescues Princess Peach from the Koopa villain Bowser and stops his numerous plans to destroy him and take over the kingdom. Mario also has other enemies and rivals, including Donkey Kong and Wario. Mario is said by many to be the most famous character in video game history. Mario games, as a whole, have sold more than 210 million units, making the Mario franchise the best-selling video game franchise of all time. Outside of the Super Mario platform series, he has appeared in video games of other genres, including the Mario Kart racing series, sports games, such as the Mario Tennis and Mario Golf series, role-playing video games such as Paper Mario and Super Mario RPG, and educational games, such as Mario Is Missing! and Mario's Time Machine. He has inspired television shows, film, comics and a line of licensed merchandise. Since 1995, Mario has been voiced by Charles Martinet.