Casinos do not intentionally make machines "hot" or "cold" by design. The perception of machines being hot (paying out more) or cold (paying out less) is largely a psychological phenomenon influenced by player experiences and beliefs. All slot machines use Random Number Generators (RNGs), which ensure that each spin is random and independent of previous outcomes. While casinos can adjust payout percentages for their machines, this is based on regulatory guidelines rather than a deliberate strategy to create specific "hot" or "cold" machines. Players' experiences of "hot" or "cold" streaks are simply part of the randomness of the game.