If you have ever played in Book Of Ra you know how attractive the game is. It's one of the most popular slots, which owes its fame to offline. The Book of Ra is a 5 reel, 10 pay line that takes players on an adventure into Try Book Of Ra Deluxe Online Slots: Play for Free, No Download Required. The Book of Ra is an exciting slot whose symbols include the pyramids, Scarab. The doors to the mysterious pyramids and the treasures that lie within are open to you in the Book of Ra Deluxe slot machine game. With 10 paylines across 5.