Creatures is an artificial life (alife) computer program series, created in the mid-1990s by English computer scientist Steve Grand whilst working for the Cambridge video games developer Millennium Interactive. Gameplay focuses on raising alien creatures known as Norns, teaching them to survive, helping them explore their world, defending them against other species, and breeding them. Words can be taught to creatures by a learning computer (for verbs) or by repeating the name of the object while the creature is looking at it. After a creature understands language, the player can instruct their creature by typing in instructions, which the creature may choose to obey. A complete life cycle is modelled for the creatures - childhood, adolescence, adulthood, and senescence, each with their own particular needs. The gameplay is designed to foster an emotional bond between the player and their creatures. Rather than taking a scripted approach, Creatures series games were driven by detailed biological and neurological simulation and their unexpected results. There were six major Creatures releases from Creature Labs. Between 1996 and 2001, there were three principal games released, the Docking Station add-on (generally referenced as a separate game) and two children's games, and there were three games created for console systems. A sequel named Creatures Online was in development, with the artificial life technology from Creatures 3 and Docking Station updated to a 3D environment.