Dive into a thrilling adventure with Book of Monsters and stand a chance to win up to 5,000x your stake. Connect blocks of 5+ matching symbols to win prizes in the base game, where 3×3, 4×4, 5×5, 6×6 and 7×7 symbols can appear randomly on any spin. Land 4-7 bonus symbols to trigger the feature with 5-8 free spins where a random symbol is chosen as the fat symbol. Players can gamble to win more free spins (up to 8) or higher-paying fat symbols before the spins begin. During the feature, if enough matching symbols appear with the Fat symbol, the Fat symbol will grow in size – from 1×1 to a massive 7×7 – awarding 1-3 additional free spins each time it grows in size.