Spectrum HoloByte

Spectrum HoloByte was the first company to publish Tetris brand games in Western Europe and North America.

History
Collaborated with Bullet-Proof Software on a few titles.

Bought Microprose in 1993, and adopted the name Microprose in 1996. Bought by Hasbro in 1998; Hasbro closed Microprose in 1999. Hasbro sold its video game assets to Infogrames, which renamed itself Atari after another studio that Hasbro had bought.

Non-tetromino games
The following non-tetromino games were developed or published by Spectrum HoloByte at one point:
 * Wordtris (Game Boy; Super NES)
 * BreakThru, a SameGame clone (Game Boy; Super NES)
 * WildSnake (Game Boy; Super NES)