1) The opening scene of the film "The Gamble" establishes the thriller genre through tense music, quick shots showing different actions, and a dramatic title sequence.
2) The victim and villain characters are introduced through their contrasting costumes and stereotypes - the victim wears a suit representing his upper-class job, while the villain wears black and a mask concealing his identity.
3) Camerawork like an extreme close-up of the victim's terrified face and a shaky shot of the dancing villain help set an unsettling tone and conceal the villain's identity. Few special effects are used to maintain grit and suspense.