Amagon, known in Japan as Totsuzen! Machoman (突然! マッチョマン, lit. Suddenly! Machoman?), is a side-scrolling platform action game for the Nintendo Entertainment System developed by Aicom. In the game, players take the role of Amagon, a Marine who is trapped on an island after his plane crashed. Inconveniently, his rescue ship is on the other side of the island, which Amagon must now cross on foot. The storyline written in for the original Japanese release was somewhat different. The main character is a scientist named "Jackson", who transforms into his "Macho Man" form, using the special drug "Macho Max" that has been taken from his plane, by the creatures of "Monster Island" Amagon encounters a variety of enemies which he can dispose of with his rifle. He also has the ability (upon collecting and then activating the Mega-Key) to transform in to a larger, stronger version of himself called "Megagon". Upon transformation, Megagon is given 1 hit point for every 5,000 points he scored as Amagon (whereas a single hit from any enemy or hazard will kill Amagon). Megagon cannot use the machine gun, but in its stead has a punch which does eight times the damage and never runs out of ammo. At the cost of one hit point each, he can also fire waves of energy from his chest; these are much broader than machine gun shots, do 16 times the damage, and can hit multiple enemies in a single blast. The last boss in the game is based on the Flatwoods monster, a supposed space alien seen in Flatwoods, West Virginia on September 12, 1952.

American Gladiators is a video game made in 1991 by for the Amiga, Sega Mega Drive/Genesis, Super NES and Nintendo Entertainment System. It is based on the popular TV game show, American Gladiators.

Anticipation is a video game for the Nintendo Entertainment System developed by Rare that was released in 1988. It is playable as a single player with computer-controlled players or multiplayer with support for up to four players.

Arch Rivals is a basketball arcade game released by Midway in 1989. Billed by Midway as "A Basket Brawl", the game features two-on-two full court basketball games in which players are encouraged to punch opposing players and steal the ball from them. Arch Rivals allows players to select from a variety of fictional teams (although arcade operators can change the team names to reflect real ones) and players. One playable character, "Tyrone" was also featured in the animated Power Team segments of the television series Video Power. Home versions of the game were released for the Nintendo Entertainment System, the Sega Genesis/Mega Drive as well as the Game Gear. Emulated versions of the game were included in the compilations Midway Arcade Treasures 2, Midway Arcade Treasures Deluxe Edition, and Midway Arcade Origins. The game has been considered a forerunner to Midway's popular arcade basketball game, NBA Jam.

Arkanoid (アルカノイド, Arukanoido?) is an arcade game developed by Taito in 1986. It expanded upon Atari's Breakout games of the 1970s by adding power-ups, different types of bricks, and a variety of level layouts. The title refers to a doomed "mothership" from which the player's ship, the Vaus, escapes.

Arkista's Ring is a video game developed and published by American Sammy for the Nintendo Entertainment System in 1990. A prime example of the action-adventure genre, the game is set in a fantasy world, and the player controls a female elf named Christine, in her quest to find the Elven ring of Arkista. It is considered to be a rare NES title.

Armadillos are New World placental mammals with a leathery armor shell. The Dasypodidae are the only surviving family in the order Cingulata, part of the superorder Xenarthra, along with the anteaters and sloths. The word armadillo means "little armored one" in Spanish. The Aztecs called them āyōtōchtli [aːjoːˈtoːt͡ʃt͡ɬi], Nahuatl for “turtle-rabbit”: āyōtl [ˈaːjoːt͡ɬ] (turtle) and tōchtli [ˈtoːt͡ʃt͡ɬi] (rabbit). About 10 extant genera and 20 extant species of armadillo have been described, some of which are distinguished by the number of bands on their armor. Their average length is about 75 cm (30 in), including tail. The giant armadillo grows up to 150 cm (59 in) and weighs up to 59 kg (130 lb), while the pink fairy armadillo is a diminutive species, with an overall length of 12 to 15 cm (5 to 6 in). All species are native to the Americas, where they inhabit a variety of environments. Like all other xenarthran lineages, armadillos originated in South America. Due to the continent's former isolation, they were confined there for most of the Cenozoic. The recent formation of the Isthmus of Panama allowed a few members of the family to migrate northward into southern North America by the early Pleistocene, as part of the Great American Interchange. (Some of their much larger cingulate relatives, the pampatheres and glyptodonts, made the same journey.) Today, all extant armadillos species are still present in South America. They are particularly diverse in Paraguay (where eleven species exist) and surrounding areas. Many species are endangered. Some, including four species of Dasypus, are widely distributed over the Americas, whereas others, such as Yepes's mulita, are restricted to small ranges. Two species, the northern naked-tailed armadillo and nine-banded armadillo, are found in Central America; the latter has also reached the United States, primarily in the south-central states (notably Texas), but with a range that extends as far east as South Carolina and Florida, and as far north as Nebraska and central Indiana. Their range has consistently expanded in North America over the last century due to a lack of natural predators.