The slot game is based on book games, where the researcher goes across the world and wants to research the Aztecs. The ten paylines make the slot game clear. The straight lines are 1-3, and the others are from the first to last reel arc over the middle ones.
If a card symbol is chosen instead of a card color, the risk is 1: 4. No hit, no profit. The book sign is the slot's core. It is both a scatter and a wild symbol, triggering the free spins. The free spins are triggered by 3/4/5 scatter and are worth ten. An extra symbol is also chosen at random.