This is the Scatter Symbol.
Fall Function means that after each spin, winning combinations are paid out and all winning symbols disappear. The remaining symbols fall to the bottom of the screen, and empty positions are filled with new symbols falling from above. The fall will continue until no more winning combinations appear as a result of the fall. All winnings are added to the player’s balance after all losses resulting from the basic back, were played.
Each time a winning symbol explodes, it marks its place on the grid. After the second explosion at the same location, a multiplier is added to it, the value of which starts at x2 and doubles each time another symbol explodes at that location. The maximum possible multiplier value is x128. The multiplier is applied to all winning combinations that land on top of it. If several multipliers are part of one winning combination, they are summed up. In the base game, all marked spots with multipliers last until the end of the series of falls and are cleared when the falls are completed.
The RTP of the game when using “BUY FREE SPINS” is 96.50%.