A jester was a historical entertainer either employed to entertain a ruler or other nobility in medieval or Tudor times or was an itinerant performer who entertained common folk at fairs and markets. Jesters in medieval times are often thought to have worn brightly coloured clothes and eccentric hats in a motley pattern and their modern counterparts usually mimic this costume. In medieval times jesters entertained with a wide variety of skills, which could include songs, music, storytelling, acrobatics, juggling, and magic. Much of the entertainment was performed in a comic style and many jesters made contemporary jokes in word or song about people or events well known to their audiences.

Jewel Master (ジュエル・マスター?) is a 1991 video game for the Sega Genesis game console. It took place in the country of Mythgard, where the protagonist, The Jewel Master must traverse the harsh lands ranging from scorching deserts to rugged mountains and through long forgotten ruins to collect the 12 elemental rings and save Mythgard from the clutches of the Demon King, Jardine the Mad.

Joe & Mac (ジョーとマック 戦え原始人 Joe & Mac: Tatakae Genshijin, lit. "Joe & Mac: Caveman Combat"), also known as Caveman Ninja, is a 1991 platform game released for the arcades by Data East. It was later adapted for the Super NES, Mega Drive/Genesis, Nintendo Entertainment System, Game Boy, Amiga, and PC.

Walt Disney's The Jungle Book is a series of video games based on the 1967 Disney animated film The Jungle Book, primarily released in 1994. It was first released by Virgin Interactive in 1993 for the Sega Master System. Conversions for the Game Boy, NES (for which it was one of the last titles released by a third-party developer), Sega Mega Drive/Genesis, Sega Game Gear, Super NES, and PC followed in 1994, and a remake for the Game Boy Advance was released in 2003. While gameplay is the same on all versions, technological differences between the systems forced changes – in some case drastic – in level design, resulting in six fairly different versions of the 'same' game. This article is largely based upon the Sega Mega Drive/Genesis version.

Jungle Strike is a video game developed (in association with Mike Posehn) and published by Electronic Arts in 1993. It was originally released for the Mega Drive, before being ported to several other systems including an upgraded version for the Amiga. The Amiga and other home computer conversions were the responsibility of Ocean Software while the Super Nintendo Entertainment System version was that of Gremlin Interactive. The game is a helicopter based shoot 'em up, mixing action and strategy. It is the sequel to Desert Strike: Return to the Gulf (a best-seller released in 1992) and is the second game in the Strike series. Jungle Strike retained its predecessor's core mechanics and expanded on the model with additional vehicles and settings. The plot concerns two villains intent on destroying Washington, D.C.. The player must use the helicopter and occasionally other vehicles to thwart their plans. The game was critically acclaimed, with some reviewers awarding scores upwards of 90%. Publications praised its gameplay, strategy, design, controls and graphics, although there were some complaints regarding the interface, difficulty and perceived jingoistic politics. The President of the United States in the game is not named, but is apparently modeled after Bill Clinton, who in a cut scene praises the player for protecting him and apologizes for cutting the defense budget.

Jurassic Park 2 may refer to: The Lost World (Crichton novel), Michael Crichton's sequel to the 1990 novel Jurassic Park The Lost World: Jurassic Park, the 1997 sequel to the 1993 film "Jurassic Park" Jurassic Park 2: The Chaos Continues, a video game for the Super Nintendo Entertainment System