Maison Ikkoku (めぞん一刻, Mezon Ikkoku) is a Japanese manga series written and illustrated by Rumiko Takahashi. It was serialized in Big Comic Spirits from November 1980 to April 1987, with the chapters collected into 15 tankōbon volumes by Shogakukan. Maison Ikkoku is a bitter-sweet comedic romance involving a group of madcap people who live in a boarding house in 1980s Tokyo. The story focuses primarily on the gradual developing relationships between Yusaku Godai, a poor student down on his luck, and Kyoko Otonashi, a young, recently widowed boarding house manager. The manga was adapted into a ninety-six-episode television anime series created by Studio Deen that ran on Fuji TV from March 26, 1986 to March 2, 1988. A Final Chapter movie, three OVAs, and a music special were also produced, with a live-action movie made by Toei in 1986. A live-action TV special aired in May 2007 on TV Asahi, with a finale aired in July 2008. Both the manga and anime have been released in North America by Viz Media.

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 (マッピー, Mappī) is a 1983 arcade game by Namco. In the United States, it was distributed by Bally/Midway. Mappy is a side-scrolling platform game that features cartoon-like animals, primarily cats and mice. The game's main character itself is a mouse. Mappy runs on Namco Super Pac-Man hardware, modified to support horizontal scrolling. The name "Mappy" is likely derived from mappo, a Japanese slang term (slightly insulting) for a policeman.

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.

Marble Madness is an arcade video game designed by Mark Cerny, and published by Atari Games in 1984. It is a platform game in which the player must guide an onscreen marble through six courses, populated with obstacles and enemies, within a time limit. The player controls the marble by using a trackball. Marble Madness is known for using innovative game technologies. It was Atari's first to use the Atari System 1 hardware and to be programmed in the C programming language. The game was also one of the first to use true stereo sound; previous games used either monaural sound or simulated stereo. In designing the game, Cerny drew inspiration from miniature golf, racing games, and artwork by M. C. Escher. He aimed to create a game that offered a distinct experience with a unique control system. Cerny applied a minimalist approach in designing the appearance of the game's courses and enemies. Throughout development, he was frequently impeded by limitations in technology and had to forgo several design ideas. Upon its release, Marble Madness was commercially successful, becoming a profitable arcade game. Praise among critics focused on the game's difficulty, unique visual design, and stereo soundtrack. The game was ported to numerous platforms and inspired the development of other games. A sequel was developed and planned for release in 1991, but canceled when location testing showed the game could not succeed in competition with other titles.