Tengen was a video game developer and publishing company owned by Atari. The company was established on December 21, 1987 as a subsidiary of Atari Games. The company is best known for circumventing the Nintendo Entertainment System’s lockout chipset and publishing unlicensed games for the Nintendo Entertainment System without the consent of Nintendo.


Activision Publish, Inc. is a leading worldwide developer, publisher and distributor of interactive entertainment and leisure products for various consoles, handheld platforms and the PC. Activision’s roots go back to the late 1970’s while four of their founders worked for Atari.