What is a stacked symbol?
A stacked symbol is a symbol that appears stacked vertically across multiple positions on a single reel, making it possible for the entire reel to be covered by the same symbol. Stacked wilds and stacked high-value symbols significantly increase the chance of large winning combinations.
How stacking creates big wins
When a high-value stacked symbol lands covering an entire reel, and similar symbols land on other reels, the resulting payout can be many times larger than a standard win. If stacked wilds cover multiple reels simultaneously, every payline becomes a winning combination.
Stacked wilds specifically
Stacked wilds are the most impactful version of the mechanic. Landing stacked wilds on two or three reels in a base game spin is often one of the highest-paying outcomes available outside a bonus round. Many classic-style video slots use stacked symbol mechanics as their primary win mechanic rather than complex bonus features.