Book of Ra Another classic, Book of Ra is a five-reel, nine-payline slot from Novomatic. It revolves around an Indiana Jones lookalike who ventures to Egypt in search of the Book of Ra. This superslot slotxo is one of the first to introduce expanding wilds, which expand to fill their respective reels. The expanding wilds are available during free spins. Book of Ra is so popular that it spawned...