The type of Wild symbols you are referring to are called Sticky Wilds. Sticky Wilds are special symbols that appear in slot machines and have the ability to substitute for other symbols to create winning combinations. The key difference between Sticky Wilds and regular Wilds is that Sticky Wilds remain in place for the duration of a free spin period, while regular Wilds will disappear after a single spin.
Sticky Wilds are an exciting feature in slot machines, as they can create multiple winning combinations over the course of a single free spin. For example, if a Sticky Wild appears on the first reel during a free spin, it can substitute for other symbols on the subsequent reels, increasing the player is chances of hitting a winning combination.
Sticky Wilds are often used in bonus rounds and free spins, and can increase the excitement and potential payout of a slot machine. They can also add an extra layer of strategy to the game, as players must decide whether to hold onto Sticky Wilds or to spin again in the hopes of hitting more of these special symbols.
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