A stacked wild is basically a wild symbol capable of covering the entire reel where it drops. These symbols are usually in bands of two, three, four, and five.
In some slot games, there is a possibility of having stacked wilds on virtually all the reels, but other slots have them only on certain reels. Those slots where stacked wilds could appear on all their reels have been known to have a higher variance.
There are also other slots whose stacked wilds appear exclusively in the Free Spins bonus feature. When you join these with multipliers, the probability of scoring a huge win is considerably increased. In a few cases, there have been huge wins where stacked wilds have netted some life-changing sum of money.
Stacked wilds work more or less like expanding wilds, but in the case of stacked wilds, a lone wild symbol is what falls on the reel before expanding into the spaces surrounding it.
There are different ways a stacked wild may fill a reel. It can either expand to fill the whole reel or expand to fill up the top or bottom area of the reel. Every game has its own rules when it comes to their stacked wilds, and such rules are seen in the paytable of the game.
To find the paytable of any particular game, simply look for the button on the gaming interface that shows menu, paytable, info, or something similar.
Essentially, stacked wilds are no different from wild symbols since they help complete winning combos by standing in for other symbols on a reel. But on the other hand, stacked wilds show a higher potential of creating winning combinations. This is possible as they can cover a much larger area than a standard wild which can only fill a single space on the reel.
When you can find them, stacked wilds are awesome slot features, as their games tend to be more volatile and provide the opportunity for tremendous wins. If you observe, you’ll notice that slot games offering stacked wilds are mostly the ones that result in serious big payouts when the player gets lucky.