A meter that increases the statistical probability of triggering a bonus feature based on symbol elimination or winning sequences.

Probability Progression Meter is a sophisticated bonus trigger mechanic where forming wins or eliminating specific symbols increases the mathematical probability of entering the bonus round. Unlike traditional meters that require a fixed number of collections to trigger a bonus, this system enhances the 'chance' of activation with every step.

As the meter fills, the game environment often changes visually to reflect the heightened probability, creating a sense of imminent luck.