This guide explains how paylines differ from cluster wins, which symbols wilds...

https://varimail.com/articles/does-a-nearly-full-meter-mean-the-bonus-is-about-to-hit/

This guide explains how paylines differ from cluster wins, which symbols wilds can replace and where their limits apply, how scatters start bonus features, and why a rising meter is only a counter, not a promise of a payout.