They can also trigger 10 free spins, and at the beginning of the Free Spins a randomly selected symbol will turn into an expanding symbol for the entirety of the bonus. Novomatic casinos, so its no surprise that they decidedto launch another, up-to-date version of this game. Free Spins may also be retriggered. Free Spins, this is the main bonus feature of Book of Ra Deluxe slot. Before the Free Games start, one symbol will be set as the expanding symbol. That means that after the each spin after the regular payout, the special can expand and cover the whole reel to create additional winning combinations. You will be give 10 free games with the special expanding symbols bonus. The Explorer is the highest paying symbol of the slot, followed by the ancient statue and sarcophagus.