Book of Books Slot — Value Score 74.9/100

Book of Books is a high volatility slot by Yggdrasil and Peter & Sons, featuring a dynamic grid that starts at 5x3 with 10 paylines and expands to 5x4 (20 paylines) or 5x5 (40 paylines) during free spins based on the number of scatter symbols landed. Gameplay centers on landing three or more book scatters to trigger seven free spins, where a random symbol is selected each spin to potentially expand across reels for wins on non-adjacent positions, with retriggers possible via additional scatters that also grant power-ups. In the base game, two scatters award random power-ups—extra spins, additional expanding symbols, or 1x/2x multipliers on expanding symbols—collected for use in free spins, up to 10 expansions possible. Visual style showcases Peter & Sons' unique, quirky art design with a mystical book theme, diverging from standard Egyptian motifs through innovative power-up collection and variable grid sizing. Golden Bet doubles bonus trigger chances for 1.5x bet cost, and bonus buy options range from 120x to 500x stake in permitted regions. RTP stands at 96.1%, hit frequency 33.26%, with max win 10,093x stake.