8 or more symbols of the same type pay anywhere on the screen. The value of the win is determined by the total number of same symbols shown on the screen at the end of a spin.

Symbols forming wins disappear, making way for new symbols to drop in that may form new wins. There is no limit to the possible chain reactions.

The Multiplier symbols are added up at the end of all chain reactions, and the total sum of all chain reaction wins is multiplied by the sum of the Multipliers. The Multiplier symbol can have one of the following values: x2, x3, x4, x5, x6, x8, x10, x12, x15, x20, x25, x50, x100, x250, x500 or x1000.

The Wild symbols substitute for all paying symbols. After taking part in a win, the Wild symbols do not disappear in the chain reaction but turn into Multiplier symbols instead.

Keeper Wilds act as Wild symbols, and additionally stay on the screen until they take part in a win. If Keeper Wilds do not take part in a win when they land, on the next spin they drop to the lowest position of the reel and remain there until they take part in a win.

Landing 4 or 5 Scatters in a spin triggers 15 Free Spins or Super Free Spins respectively. Landing 3 or 4 Scatters in Free Spins awards 5 additional spins. In the case of 4 scatters, the remaining spins are also upgraded to Super Spins. The 5th Scatter in a base spin, as well as the 4th Scatter in Free Spins are always visualised as Super Spins. Scatters cannot land in Super Spins. 2 options are present at the start of the bonus round. Picking an option reveals the type of Free Spins won – Strom Spins or Thunder Spins.

In Storm Free Spins the Multiplier values that take part in wins are added up and saved above the reels as a total Multiplier which does not reset until the end of the bonus round. Each time a new Multiplier takes part in a win, it is added to the current total Multiplier, the sum is applied to the win and then becomes the new total Multiplier. Wins that are not in a combination with a newly landed Multiplier symbol do not activate the total Multiplier. In Storm Super Spins the Multiplier symbols hold a minimum Multiplier of x5. Additionally, the total Multiplier is applied to all wins, even to wins without a newly landed Multiplier.

In Thunder Free Spins all Multiplier and Wild symbols are replaced with Keeper Wilds. Additionally, a progress bar with 3 levels appears. Each level has 3 steps and each Keeper Wild that lands during the bonus round fills 1 step. The Keeper Wilds that fill the last step of a progress level are guaranteed to turn into Multiplier symbols, holding the Multiplier shown on the progress bar for that level. The Multipliers for each level are x25, x100 and x500. In Thunder Super Spins the Keeper Wilds turn into Multiplier symbols with a minimum value of x5. Additionally, the Multipliers for each level of the progress bar are x50, x250 and x1000. After the Keeper Wild that filled the last level of the progress turns into a Multiplier symbol, the progress bar is reset and the Multiplier values for all levels are set to the Multiplier of the last level, allowing that Multiplier to be won multiple times.

The maximum win amount is limited to 20,000x your current stake. If the total win of a game round reaches 20,000x the round immediately ends, and the maximum win is awarded. If there are any remaining Free Spins they are forfeited.

The following features can be bought in the game: 1) Bonus Hunt - The chance of landing Multiplier, Wild and Keeper Wild symbols is 5 times greater. 2) Multiplier Rage - The chance of landing Scatters is 5 times greater. 3) Strom Free Spins - 4 or more Scatters are guaranteed to land and trigger the Storm Free Spins or Storm Super Spins bonus round. 4) Thunder Free Spins - 4 or more Scatters are guaranteed to land and trigger the Thunder Free Spins or Thunder Super Spins bonus round. 5) Storm Super Spins - 5 Scatters are guaranteed to land and trigger the Storm Super Spins bonus round. 6) Thunder Super Spins - 5 Scatters are guaranteed to land and trigger the Thunder Super Spins bonus round.