Hit three scatters in one spin sequence to trigger the free spins feature with initially eight free spins which is the main attraction on the Wild Worlds slot. And best would be to make sure you have time on hand to get through them as there are three worlds with monsters waiting to be defeated.

First, the game leads to a second screen with a world selector to determine in which world the first battle will take place. It then returns to the main screen with the left side of the game client changing to a battleground with the three monsters, each with a health meter, in the background. In front are the three heroes with a Hero meter underneath of each.

The aim in the bonus round is to beat three Captains and the Boss to progress through a total of three worlds. Defeating the captains and the Boss is done by scoring winning combinations with low and medium-value symbols. Each win will give the heroes two powers to attack the monsters and cause damage to them.

• Hero Attack: any winning combination with low-value or medium-value symbols will deal damage to the monsters and charge the Hero meter of the hero matching in colour with the winning combo.
• Hero Super Attack: It takes three wins to fill up the Hero meter and launch the Super Attack, which will deal extra damage to the monsters.

In the first round, you will have to defeat the three Captain monsters, after which the Boss will appear. The Captain monsters have 15 health points while the Boss monster has 105 health points. An attack or super attack will reduce the health points of a monster by 1 to 4 points.

You will progress to the next world after defeating the Boss of the current world, at which point the game retriggers eight free spins. In each world, extra wilds are awarded for every Captain and Boss that is eliminated. A friendly bird-looking alien will drop them in specific patterns on to the game grid, based on which world the current battles take place:

• Green Dark Forest – Spreading Wilds: A number of wilds are spreading to random positions on the reels.
• Blue Ice World – Heavy Wilds: One stack of two wilds is placed on a random reel position.
• Red Fire Lands – Random Wilds: Two to four wilds are placed on random reel positions.

The feature ends when you have no free spins left. All wins are accumulated and paid once the feature concludes. Getting trough all three worlds in one bonus rounds will almost guarantee a super mega win.