Book of Sun (3 Oaks Gaming (Booongo)) – Review & Demo Play

Book of Sun - Game Overview

I’ve spun Book of Sun from 3 Oaks since its early days. It runs on a 5x3 layout with 10 fixed paylines and a left to right payout rule. The theme sticks to pharaohs, scarabs, and pyramids, and bets start at 0.20 per spin and go up to 33, suiting small and mid stakes. Line wins need three of a kind on lows, while premiums can pay from two. The core play is simple and brisk, with the expanding symbol bonus doing most of the heavy lifting.

Symbols and Paytable in Book of Sun

The low symbols are 10 through A. On 10, J, or Q, I’ve had 0.5x for three, 2.5x for four, and 10x for five. K and A step that up a touch, paying 0.5x for three, 4x for four, and 15x for five. You need lines to start from reel one and follow one of the ten routes. These small hits keep the balance ticking over while you wait for the feature or a set of premiums to land across.

Premiums bring the punch. Bird and Scarab pay from two of a kind, with 0.5x for two, 3x for three, 10x for four, and 75x for five. Horus goes 0.5x, 4x, 40x, and 200x, while Pharaoh leads the board with 1x for two, 10x for three, 100x for four, and 500x for five. The Book symbol acts as wild and scatter in the base. During free spins it cannot stand in for the chosen special symbol when expansions are in play.

Book of Sun Symbols and Paytable

Symbol	Quantity	Payout
	5	x500
	4	x100
	3	x10
	2	x1
	5	x200
	4	x40
	3	x4
	2	x0.5
	Scatter
	5	x200
	4	x20
	3	x2
	5	x75
	4	x10
	3	x3
	2	x0.5
	5	x75
	4	x10
	3	x3
	2	x0.5
	5	x15
	4	x4
	3	x0.5
	5	x15
	4	x4
	3	x0.5
	5	x10
	4	x2.5
	3	x0.5
	5	x10
	4	x2.5
	3	x0.5
	5	x10
	4	x2.5
	3	x0.5

Book of Sun Free Spins

Three or more Books in the base trigger 12 free spins in Book of Sun. At the start, a symbol is picked to become the special expander. When enough copies land, it expands to fill its reels and pays as a scattered set, so adjacency is not needed. For lows you need three, for top symbols two will do. That shift from line pays to counting anywhere is where the slot can swing a session in your favour.

Retriggers are possible. Land three or more Books again and you get another 12 free spins with the same chosen symbol, which keeps the streak alive. It can stack nicely if the Books show up in clusters. The Book still acts as the wild for normal wins, yet it won’t replace the special symbol during the feature. My best runs came from mid symbols turning frequent, then expanding across three or four reels for tidy totals.

How To Play Book of Sun Slot For Real Money

Getting started on Book of Sun for real money is plain. Pick a stake between 0.20 and 33, note the fixed ten lines, and spin with a set session budget in mind. I like to warm up on the demo, then move to cash once I’m happy with the pace. Small, steady bets fit the low variance, keeping you in play long enough to catch a feature. Set limits, avoid chasing, and use any fair promotions that suit your bankroll.

Book of Sun RTP, Volatility, And Max Win

Book of Sun runs at 96.8% RTP with low volatility, so wins pop up often but the average size is modest. The top advertised haul is 5,000x, which sits on the upper edge for this style of game, though you’ll mostly see steady base returns and the occasional free spins surge. In practice, RTP needs volume, and the variance profile helps you put in that volume without wild swings. It’s a forgiving curve for session play and wagering.

The 200 Spins Book of Sun Slot Experience

I ran a 200 spin test at 2.50 a go. The base game fed regular small line wins, which matched the low variance feel. The first three Books landed within the opening stretch and the chosen expander was Q. That round retriggered once for 12 extra spins, and I saw a couple of three reel expansions pay across the board. Nothing blew the doors off, yet the meter climbed in tidy steps, driven by frequent hits and the retrigger.

Later in the set, the Books came back for another 12, again on the same symbol. The expansions were patchy but non adjacent counting helped, and the total after 36 free spins cleared 500 returned from that 2.50 stake. Outside the feature, the better premiums showed up sparsely, which is normal here. The flow felt fast, with reels that stop quite abruptly, and I settled into a rhythm of short spells between features and a balance line that drifted upward.

Review Summary for Book of Sun

Book of Sun sticks to a classic plan. A clean 5x3 grid, ten lines, and the book mechanic with an expanding symbol carry the show. It looks decent, runs fast, and the maths is kind to long sessions. On the flip side, you won’t find multipliers, side games, or extra layers beyond the core feature. If you want a straight take on the format with a fair payout rate, this ticks those boxes without fuss.

Strengths for me are the above average 96.8% RTP, the easy to read paytable, and the way retriggers can extend a round. The premium set pays from two, which helps. The Book acting as both wild and scatter keeps the base game active. Weak points include the generic theme and that abrupt reel stop, which can feel a bit clunky after a while. Variety is thin, so the appeal rests on pacing and the expanding symbol runs.

As a regular spinner, I treat Book of Sun as a steady grinder. I keep stakes modest, aim for volume, and let the expander do the heavy lifting when it arrives. Wins stack through repetition rather than spikes, but a strong premium choice in the bonus can still throw a highlight result. If you favour Egyptian slots and a simple feature loop, this slot does the job and pays its way over time with sensible play.