Trog was first released in arcades by Midway in North America in March 1990 and later in Europe by Williams in February 1991. In 1990, a faithful conversion of the game by Software Creations was released for DOS computers by Acclaim Entertainment. However, the DOS version only supports two players instead of four, featuring Bloop and Rex as playable characters. In October 1991, the title was then ported to the Nintendo Entertainment System by Visual Concepts and first published by Acclaim in North America and later in Europe. The NES version has a number of key differences such as visuals and sound, two-player support with Bloop and Spike as playable characters instead of four, among other changes.