Additionally, casinos may also adjust the random number generators (RNG) used by these machines to further control the outcome of each spin. This means that if a slot machine has been paying out more than it should, the casino will slow down or stop its payouts until it’s back in line with its expectations. First, they usually use software that monitors the games and limits payouts if certain conditions are met.
Casinos use a variety of strategies to tighten their slot machines.