Book of Ra

Greentube calls Book of Ra the game that launched the line: an Egypt-themed slot with 5 reels, 9 paylines and free spins that use an expanding symbol.

A base-game win needs 5 matching symbols on a payline. Each combination starts at the left and continues to the right, and the symbols must sit beside one another without a gap. The book symbol, the joker, substitutes for every symbol. Three or more books start 10 free spins. Before the round, one special symbol is chosen at random as the expanding symbol. When it lands 2, 3, 4 or 5 times, the bonus-symbol value is multiplied by the number of paylines. Greentube lists volatility 5, Egypt and mythology themes, NovoSDK, plus desktop and mobile play.