Weekend Box Office

LOS ANGELES (AP) - The college thriller ``The Roommate'' has moved into the top spot at the box office with a $15.6 million debut over a typically slow Super Bowl weekend as the NFL championship game preoccupies movie fans.

The Sony release features Leighton Meester as a psycho freshman who becomes obsessed with her new roomie (Minka Kelly).

The 3-D underwater cave adventure ``Sanctum,'' whose producers include ``Avatar'' creator James Cameron, drew modest crowds and came in second with $9.2 million. Released by Universal, ``Sanctum'' is a survival story about explorers trapped underground in flooded caves during a monster storm.