A cloning creche was a group of clones who were put together for some reasons, usually because they were to serve the same purpose.
Annika Hansen's creche was invited to test-run a holodeck program that has been repaired due to a nanite infestation. The holodeck program, before the nanite infestation occured, was the fight against the final boss of Magisters' Terrace in World of Warcraft. (RIS Bouteina)