Another World (known in the United States as Out of This World) was released in 1991, by a single man, Eric Chahi (who has recently returned to game development with From Dust). The original release was for the Amiga, a system which I have never even seen, let alone owned, but there was a DOS port a year later, which I did play. The game made a big impression on me, as it did for many others, for reasons I will discuss.
In 2006, Eric Chahi released the Another World 15th Anniversary Edition, an updated version of the game that runs natively on Windows, has optional updated graphics, some improved checkpointing, and a bunch of extras including making-of videos. I recently got around to playing the new edition, which inspired me to write a History Lesson about it.