Tower of Mystery

Tower of Mystery was originally developed by Mattel under their M Network label and was going to be the third game in their Dungeons & Dragons series after Cloudy Mountain and Treasure of Tarmin, both of which were released on the Intellivision, with a planned release of 1983 or 1984. Unfortunately Mattel shut down its video game division prior to the game's release.

The game would eventually be released on the Intellivision by INTV, however INTV removed the Dungeons & Dragons branding and renamed the game Tower of Doom. Atari finally released Tower of Doom for the Atari 2600 in 2024 in DLC for Atari 50: The Anniversary Celebration.

Although they were developed at the same time, the Intellivision and Atari 2600 versions of the game are rather different. This is not only due to the less sophisticated hardware of the 2600 but also because the gameplay of the Intellivision version was still in the process of being defined when programming on the 2600 version was started. Programmer Jane Terjung was a huge Dungeons and Dragons fan and was given free reign to make the game any way she wanted so it deviates from the Intellivision version in several ways. However the games do share many similarities including the map screened used to move around the tower, the inventory system, scrolling text, and the close up battles when fighting monsters.