A Stacked Wild in a slot game is dependent on the word, “Stacked”, which means a bunch of things tacked on top of one another. In this case, it is Wild symbols that are stacked on top of each other, essentially covering almost the entire reel on the grid. This allows more combinations to be landed by having more the same symbol act as a substitute.
A Stacked Wild can be activated in a slot game by a few different ways, ranging from simply landing them on top of each other during a spin or having them already come in a stack in the first place. Sometimes you can activate it by having the power to lock them into place and then landing more of the same in the next spin.
Sometimes a Stacked Wild may only play in a slot game during the Free Spins round or triggered from another type of bonus feature. Since it provides greater chances of winning, it must need an obstacle for the player to pass through in order to acquire it. Sometimes it can even be doubled or tripled on the reels unlocking more winning combinations in the game.
Gaining a Stacked Wild in a slot not only improves your chances of scoring but it may also hold the key to winning the biggest prizes in the slot game. A Wild symbol, for example, may hold the biggest jackpot, so having a bunch of them on a single reel can get you one step closer to said reward.
If not, then the advantage of a Stacked Wild may not increase the size of your prize at all, perhaps even preventing you from landing a much higher valued symbol.
Stacked Wilds can come equipped with the same features as a regular Wildin a slot game, only this time it applies to the entire Stack.