Book Of Oil Slot Machine

The Book Of Oil slot machine features a theme set near an oil well among huge pumps and large barrels to be filled. The slot rules include 5 reels with 10 paylines always active, on which you can create winning combinations associated with prizes from 50 to 50000 coins. There is also a wild joker symbol that, when drawn in 3 reel positions in one game, allows you to activate a free spins bonus with 10 free games during which one of the game symbols is transformed into an expandable symbol.