In both JetX and Zeppelin games, the maximum multiplier is theoretically infinite. These games allow the multiplier to increase as long as the vehicle (jet in JetX and airship in Zeppelin) continues to ascend without crashing. The game ends, and the multiplier stops increasing once the vehicle crashes. However, the practical maximum multiplier a player might achieve is limited by the timing of their cash-out decision and the unpredictable moment when the crash occurs.