Rogue is a dungeon crawling video game first developed by Michael Toy and Glenn Wichman around 1980. It was a favorite on college Unix systems in the early to mid-1980s, in part due to the procedural generation of game content. Rogue popularized dungeon crawling as a video game trope, leading others to develop a class of derivatives known collectively as "roguelikes". For example, it directly inspired Hack, which in turn led to NetHack.