Developer Book of Sun: Choice is a five-reel, ten-line slot from 3 Oaks, released in April 2020. The game uses an Egyptian temple theme and a high-volatility format, with reported RTP ranging from 95.76% to 97.74% and stake sizes from 0.2 to 30.
Three Book scatter symbols trigger the free spins bonus round. Before the feature begins, players choose one expanding symbol that remains active throughout the round. When it lands, it expands to cover the full reel, and wins with the expanding symbol are paid outside standard payline rules.
The bonus can be retriggered by landing three additional scatters, with each retrigger allowing another expanding symbol to be added, up to nine in total. A demo version is available, letting players play for free and practice before playing for real money.
