
Depending on where one looks, legal concerns over the Tetris game are not necessarily new. In 1989, the notable game Tetris: The Soviet Mind Game, which was produced by Tengen, was removed from the market after a legal ruling against Tengen. (It would be interesting to know as to whether the actual issue was one of copyright or trademark.) In addition, it has been said that there was a now-obscure Tetris game that was released for the Sega Megadrive console.
Over the years, there have been multiple instances where games have resembled existing games. For instance, on the Apple Macintosh platform, there was the shareware Bakudanjin game which has been regarded as a clone of the Bomberman video game. (According to the iDevGames "Bakudanjin Postmortem" article, producing a game that constituted a clone was one of the aspects that didn't work so well with the Bakudanjin project, even though the Bakudanjin game was successfully released.) In addition, there was the freeware Arashi game which is said to be similar to the Tempest video game.
"If it's not loud, it doesn't work!" -- Blank Reg, from "Max Headroom"