Mercury 
Novoline 
Bally Woof 
Amaya 
EGT 
IGT 
Lion Play 
Microgaming 
NetEnt 
Play'n GO 
Playtech 
Pragmatic play 
Relax gaming 
All online slot machines featuring additional wild symbols.
What are Extra Wilds?
Extra wilds are symbols that act as placeholders and appear in addition to existing wilds during gameplay. This bonus feature can occur both in the base game and as a special feature in free spins and bonus rounds. Specifically, existing symbols or a specific type of symbol can be transformed into additional wilds, or existing symbols can be overlaid with wilds. These extra wild symbols can typically appear at any position on the game board, so they don't have to be adjacent to an existing wild.
How does this feature work?
functionality
Extra wilds are fairly self-explanatory just by their name. In simple terms, you get additional wild symbols in certain gameplay situations. Depending on the slot machine, extra wilds can appear either in the base game or as a bonus during the free spins round. This can involve random extra wilds appearing anywhere or specific symbols being designated as additional placeholders. One thing is certain: with a bit of luck, you can rake in some nice winnings.
Increased chances of winning
Wilds are undoubtedly some of the most coveted symbols when playing online slots. Apart from any other additional features, the wild symbols can easily complete or even extend symbol rows, allowing you to rake in great winnings. Extra wilds take this principle to a whole new level. After all, they significantly increase your chances of either generating a win in the first place or enhancing your existing win. By incorporating extra wilds into the game, you not only amplify the excitement but also maximize your potential rewards. The thrill of landing those wilds and witnessing the transformation of your gameplay experience is simply unparalleled. So, keep an eye out for those wild symbols and let them unleash their magic on the reels, as they have the power to turn an ordinary spin into an extraordinary win.
In the free spins round
It gets especially profitable when Extra Wilds appear during the Free Spins. The mechanics stay the same, of course. However, all the spins are free. This means your chances of winning are quite good with the combination of free spins and Extra Wilds. That gives you promising prospects of achieving higher payouts compared to playing without Extra Wild.
Special variants
Not every online slot that offers Extra Wilds utilizes them in the same manner. However, apart from that, it's also possible for providers to combine Extra Wilds with other features. For instance, in Microgaming's Avalon 2, not only can you choose which symbol type will act as an additional Wild, but you also receive a multiplier on that particular symbol.
