Book of Ra

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

In the base game a win needs 5 matching symbols on a payline. Each combination starts on the left and runs to the right, and the symbols have to sit next to each other 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. If 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, and desktop and mobile play.