I watched it because it was highly rated on IMDb

Rating: 2/10 (21 July 2012)

Really? 7.5 stars? Why?
Not a bad premise but so ridiculous and badly acted that I can't see why anyone would give it more than 5 stars. The actors who played Quentin and Holloway were so bad that I looked them up and was surprised to see they had actually appeared in other films. I can give the actors a break though since the characters were so unbelievable that maybe no one could have make them believable.
One big problem, the coordinates Leven is supposed to work out. If the rooms move, wouldn't their coordinates have to change? So you would never know where you are. Other people have already pointed out Leaven's inability to recognize that numbers that end in 5 or 2 can't be prime or that Kazan was wrong about the number of prime factors of various numbers. These are details that make a difference. Anyone who knows a lot about math (not me in other words) would just slap their forehead and turn Cube off. Which is what I should have done.