Firestorm is a 5 reel, 25 bet line video slot. The game features stacked symbols and a respins feature with locking symbols.

Wild Symbols
The game has two different types of Wild Symbols:
Regular wild symbols substitute for all symbols except Bonus symbol.
Bonus symbols substitute for all other symbols.

Bonus symbols
Two or more Bonus symbols in the Main game initiate the Respin feature.
When three Bonus symbols appear in the Main game, the Respin feature is initiated and the Main game win is multiplied by 2.

Respin Feature
At the beginning of the Respin feature, a symbol is randomly selected, and that symbol, along with Regular wild symbols and Bonus symbols, are the locking symbols for that Respin feature. All of the locking symbols that appear on the initiating spin are locked into place, and the reels are spun again.
On a respin, if there are any locking symbols that appear that did not appear before the respin, those symbols are locked into place, and if not all of the positions on the reels are locked, another respin is awarded.
For each Bonus symbol that appears after the 2nd Bonus symbol, the Respins multiplier is incremented, up to a maximum of 5x.
When all positions are locked or no new locking symbols appear on a respin, the Respin feature ends.
The total win from the Respin feature is the Main game win from the initiating spin at the initiating multiplier, plus the win evaluated on the final respin times the final Respin multiplier.