Microsoft released Alexey Pajitnov's puzzle game Pandora's Box in 1999.
The Windows game combines a series of puzzle challenges with an adventure framework based loosely on Pandora's myth. Players work through varied puzzles while pursuing the evils that have escaped from the legendary container. Microsoft both developed and published the title.
Its release date places it in the late-1990s wave of CD-ROM computer games that could support richer presentation and multiple gameplay modes than many earlier home-computer puzzles. The game is especially notable because its designer, Alexey Pajitnov, had already become famous for Tetris.
The year is often confused with the release dates of other products called Pandora's Box, including films, music compilations, and later games. The 1999 date belongs specifically to Microsoft's Windows puzzle title, not to the 1929 film or Aerosmith's 1991 box set.