At least one of the U.S. 3.5" floppy disk releases contained an interesting form of copy protection. In addition to the game randomly asking you on game start-up to insert the 3.5" floppy install disk to verify you have a legitimate copy, the install disk itself was "defective by design". Portions of the disk have an invalid file and/or cluster structure. Running the disk through a disk checking program such as Windows Scandisk will show these errors, but they're all "by design", so it's important that you don't correct them using such a program. Even if you copied the disk using specialized disk copying programs, more often than not, the copy will not be accepted by the game when it asks you to insert the install disk.
This was the most popular choice when Amiga Power magazine asked a number of famous programmers which Amiga game they wish they'd written and why. Archer Maclean was impressed by its cuteness and attention to detail, while Andy Beveridge said "It's refreshingly different, and fun too... and it's going to make lots of money, I'm sure" - other programmers echoed this final point.
Lemmings appears in the book 1001 Video Games You Must Play Before You Die by General Editor Tony Mott.
The author Terry Pratchett claimed that he was so addicted to the game that he forced himself to delete it from his hard drive and even wipe the original disks, as he was so worried about missing deadlines due to playing it too much.