Tetris is a puzzle game released for the NES in 1989, the same year the immensely popular Game Boy pack-in released and 4 years after the original DOS release by Alexey Pajitnov. In its first six months of release by 1990, Nintendo's NES version of Tetris had sales of 1.5 million copies totalling $52 million (equivalent to $128 million in 2023) - so, popular then. Ironically though, in the long-term the GameBoy and Atari versions were held up as the better versions available at the time, and the NES version is missing the arrangement of "Korobeiniki", present in the GameBoy version, which has become strongly associated with Tetris.