The Golden Book is the Scatter and Wild symbol in the game. 3 Scatters in the main game trigger the bonus game with expanding symbol.
Free Spins start when 3 or more Scatters appear on the reels. The symbol which appeared in the one opened cell on the 6th reel will play the role of the Expanding Symbol in the bonus game. During the bonus round additional Free Spins can be won. Also, the player can buy a bonus: round of free spins.
Expanding symbol feature in the bonus round works in the following way. One symbol selected in the 6th cell in the main game, plays the role of expanding symbol in the Free Spins round. During the bonus round and after payout of regular symbols, the special symbol will expand occupying 3 positions on the reel. This symbol plays as a regular symbol even not on the adjacent reels and on all lines played.