All three films are based on the same premise: there is a gigantic, mechanical, cubical structure of unknown purpose and origin, made up of lots of smaller cubical rooms. Each of these rooms has six doors, one on each face of the cube. Some of these rooms are “safe”, while others are equipped with deadly booby traps such as flamethrowers and razorwire.
In each case, a group of strangers awakens in this mysterious structure, without any knowledge of how or why they are there.
My note: The first film was big for Canadian horror. It’s a little-known flick with a cool but simple concept. The sequels are considered by most to be pretty bad comparatively, but I actually found a lot to love in both of them (controversial as that may be). Each adds something a little different than the last.