Puppets(2007) - Shadow

The story begins with eight strangers who wake up in an abandoned, high-tech mental institution or research facility with no memory of who they are or how they arrived. Clad only in their underwear, they must navigate the labyrinthine hallways to find an exit. However, they soon discover they are not alone; a lethal, incorporeal shadow creature is hunting them, capable of slaughtering its victims in an instant. Shadow Puppets (2007) - IMDb

Released in 2007, Shadow Puppets is a psychological horror thriller directed by Michael Winnick that blends the "locked-room" mystery of Cube with the supernatural dread of a monster movie. Plot Overview Shadow Puppets(2007)