The mechanics are authored by NetEnt. As is typical for such slots, the game starts with 3×3 reels. After each winning combination, the current reels are fixed, and another one is added to the right, and so on ad infinitum, while the winnings continue.
A random multiplier may appear at any time, and if more multiplier symbols appear on the additional reels, then their values are added. This function is called Fire Eggs, but there is also a Fire Wilds function, when one or two reels light up, on which wild symbols appear instead of the usual ones.
Free spins are the key moment, during this round all symbols disappear except for one randomly chosen one, as well as wild ones, Fire Eggs and the sign of two additional spins +2 Spins. Overall, a solid release, payouts up to 10.454x, high volatility.