Book of Ra is a terribly classic, conservative slot that has become a template for many other slot machines. See for yourself: 5 game reels with three lines of symbols. Today, such mechanics are embedded in most of the modern slots. And there is nothing surprising in this: it is extremely simple and works perfectly. When 3-5 golden books fall out, the bonus game begins. It is no different from the usual one, with the only difference that the next 10 spins will be completely free. Thus, the player can significantly increase his capital without any risks. Well, in the event that 3-5 golden books fall out on the reels again during the bonus game, then 10 more are added to the remaining number of free spins! By the way, if you have 4 books at once, then your winnings will increase 20 times, and if 5, then 200!