Dig Dug (ディグダグ, Digu Dagu) is an arcade game developed and published by Namco in Japan in 1982. It runs on Namco Galaga hardware, and was published outside Japan by Atari, Inc..

Atari also obtained the license for home versions of Dig Dug, and released it for the Atari 2600, Atari 5200, Atari 7800, Intellivision, Apple II, Atari 8-bit family, VIC-20, Commodore 64, IBM PC, and TI-99/4A. Namco ported Dig Dug to the Nintendo Family Computer in 1985.

Gakken made a table top handheld game of Dig Dug in 1982. It was one of a series of 3 flip-top games with VFD screen and magnifying Fresnel lens.

Double Dragon (Japanese: 双截龍 (ダブルドラゴン), Hepburn: Daburu Doragon) is a 1987 beat 'em up video game developed by Technōs Japan and distributed in North America and Europe by Taito. The game is a spiritual and technological successor to Technos' earlier beat 'em up, Nekketsu Kōha Kunio-kun (released outside of Japan by Taito as Renegade), but introduced several additions such as two-player cooperative gameplay and the ability to arm oneself with an enemy's weapon after disarming them. Double Dragon is considered to be one of the first successful examples of the genre, resulting in the creation of two arcade sequels and several spinoffs, as well as inspiring other companies in creating their own beat 'em ups.

Originally an arcade game, home versions were released for the NES, Master System, Atari 2600, Atari 7800, Atari ST, Amiga, Amstrad CPC, Commodore 64, Game Boy, Genesis/Mega Drive and Atari Lynx, among other platforms during the series's height of popularity. A remake titled Double Dragon Advance was released for the Game Boy Advance in 2003. The NES version was re-released for the Wii's Virtual Console on April 28, 2008 in North America at a cost of 500 Wii Points. Nintendo also released the Game Boy version on the Nintendo 3DS Virtual Console in 2011.