The vast majority of people with mental retardation have IQ levels of 55 to 69 and are considered mildly retarded. Mildly retarded children often go undiagnosed until they are well into their school years. They are often slower to walk, talk, and feed themselves than most other children.
When Tom Six began creating the Human Centipede sequels, he envisioned a trilogy that works as a movie centipede. Each sequel opens with the ending of the previous film, as the events of that film influence said sequel.
Centipede made its worldwide debut in 1981. The sequel to Centipede, Millipede came out in the year 1982. Both games were developed by Atari. A revamped version of Centipede was made available in 1998 for two video game consoles as well as the computer. There are many differences between the original version of Centipede and the title released in the late 1990s. A second re-release of Centipede premiered in 2011.