Casinos use a variety of psychological tricks to keep players engaged and continuously spending money. These include highlighting the possibility of winning a jackpot, creating the illusion of near wins, providing positive reinforcement through flashy graphics and sounds when winning, and offering variable reinforcement schedules that make it hard to predict when a big win will occur. They also exploit cognitive biases like the gambler's fallacy and give the illusion of control, such as allowing players to stop spins on slot machines, which in reality has no effect on the outcome.