Additional features are one of the main features that motivate users to choose in favour of a particular title. For many sophisticated players, standard reel spins are not enough. Developers are actively introducing additional prize features into their products, which differ not only in structure and plot but also in the principle of activation. In this article, we will look at the slots with the most interesting bonus rounds.
Gladiator
The thematic round called Coliseum Bonus starts when three or more scatters appear on any reel. The gambler enters the weapon room where the gladiators are preparing for battle. Four rows of stone slabs appear on the screen. The player is invited to sequentially open one value in each row.
Iron Man
The bonus game combines a full bonus round and free spins. A separate screen opens, and rockets appear, rushing towards the hero. The user’s task is to shoot down shells, receiving prizes for them. Rockets can contain coins, free spins and multipliers.
Wild Guns
The bonus game can be activated randomly after any spin that has not been crowned with a win. A tornado appears on the screen. A sandstorm sweeps across the reels and turns several symbols into wilds, after which the payouts are calculated.

Tycoons
Before the start of the bonus, you are asked to choose one of the characters who are sitting at the poker table. Then the characters place bets, evaluate their cards, refuse bets or raise. If the selected character wins, then a reward is awarded to the player.
Gold Diggers
After reading the leaflet, friends-gold miners put a stick of dynamite under the reels, blow up the playing field, fall into a hidden tunnel, and a beautiful blonde joins them. The gambler’s action activates the characters who begin to actively hammer the wall with pickaxes in the specified place. When gold appears from the ground, the player receives a random number of coins to the account.
The main distinguishing feature of these machines is that access to the bonus function is opened after the user accumulates the number of conditional points for repeating a particular game event. This can be a specific symbol or combination. In some games, points are awarded for spins without a win. The interface of most slots of this type includes a scale. It fills up gradually, showing how long the player has to wait for the bonus to be activated.
The competition among online slot providers is very strong, and dozens of studios are constantly launching new slot machines. They come out at different times, from different developers. Recently, however, companies have been offering players exciting and very beautiful bonus rounds.