A wild symbol, also called a substitute symbol, can replace any other symbol to make a winning combination complete. Wild symbols are obviously very useful for players because they increase the chances of a payout.
Online slots have their own themes, and the wild symbol is usually related to the theme, for example T-Rex in the game called T-Rex. Sometimes the logo of the game is the wild symbol, like in the Summer Holiday game.
In an enabled payline five wild symbols usually mean the largest fixed jackpot. Wild symbols are often multipliers too – they multiply the payout of the combination they complete. Sometimes the multiplier is fixed and it doesn’t matter how many wild symbols complete the combination. In other cases the number of wild symbols changes the payout.
The wild symbols can be made even more exciting when there are different types of them. The most popular ones are stacked wild symbols. When they appear, all symbols in every reel are wild symbols, which means a lot of different winning combinations at once and large payouts. Expanding symbols are similar, but instead of appearing as separate symbols in each row, they expand and cover the whole reel as one symbol.
Exploding wilds means that for one spin random symbols are converted into wild symbols. For example in the T-Rex game, the T-Rex eats the dinosaurs from other reels and replaces them with T-Rex symbols.