Book of Sun is a 2018 Egyptian slot from Booongo, now 3 Oaks Gaming, and the first game in its Book of Sun series. It follows the classic book format: a 5x3 grid with 10 paylines, a book that works as wild and scatter, and free spins with an expanding symbol. Catalogues list a 5,000x top prize and a 96.8% RTP. It suits you if you like book style slots and want a simple version from a smaller studio.
How does Book of Sun work?
You play five reels and three rows with 10 paylines. Matching symbols from left to right pay, with Egyptian characters at the top of the paytable and card ranks at the bottom.
The Book of Sun symbol acts as both wild and scatter. It substitutes for other symbols on lines and pays on its own when several land anywhere on screen.
What are the Book of Sun bonus features?
Three or more books start the free spins round. Before it begins, one regular symbol is chosen at random to be the expanding symbol for the round.
When enough of the expanding symbol lands, it grows to fill whole reels and pays across all lines, even when the reels are not next to each other. A high symbol chosen as the expander gives the best chance of a large result, while a low symbol often leads to smaller totals. The later Multi Chance and Choice versions add extra expanding symbols and a bonus buy.
Is Book of Sun worth playing? RTP and volatility explained
The listed RTP is 96.8%. Booongo now trades as 3 Oaks Gaming, and its games may be offered in more than one RTP version. The help screen at your casino shows which one you are playing.
One catalogue lists volatility as low, which is unusual for a book slot where the result of the bonus depends so much on one symbol. Because these figures come from a single source, check the game rules at your casino before deciding on a stake.
Book slots are one of the most common formats online, and many providers have their own version. Book of Sun sticks closely to the standard rules, so if you know how one book game works you already know how to play this one. The difference between titles is mostly in the RTP, the cap and the visual style.
Tips before you play Book of Sun
- Confirm the RTP and max win in the game rules, since the figures come from one source.
- Make sure you open the original Book of Sun and not Multi Chance or Choice.
- Try the demo to see how often the books land.
- Pick a stake that lets you reach free spins several times.
- Set a loss limit before you begin.