Here2Win Casino · SYNOT Games · Australia
Book of Secrets Extra pokie on Boomerang Pokies
Australian punters can open the session page for Book of Secrets Extra pokie apart from this catalogue.
Boomerang Pokies files Book of Secrets Extra as a SYNOT Games pokie for Australia and sends the session to Here2Win Casino. The card has no published RTP, so this preview does not invent one.
What this pokie is
Boomerang Pokies sends you out and back: read Book of Secrets Extra here, play it at Here2Win Casino, return to the same URL if you want the figures again. The pokie itself does not boomerang a loss into a win.
A normal session on Book of Secrets Extra is a run of spins with a stake you picked, not a plan to clear a bonus. Here2Win Casino may show its own welcome offer inside the account. If you do not want a bonus, do not tick it.
Before the stake, use the fact list and the pros and cons. Neither one adds a star rating. Book of Secrets Extra is the SYNOT Games pokie, and the reels run at Here2Win Casino.
The studio behind it
SYNOT Games is the studio printed on Book of Secrets Extra. Boomerang Pokies lists 168 of their pokies for Australia, and this is one of them. Open that page if you want a neighbour title from the same studio.
Studio certification & mechanics
SYNOT Games (SYNOT Games Studio) is an iGaming studio headquartered in International iGaming Studio. Its random number generators (RNG) and math models are audited by Independent RNG & math verification (GLI / iTech Labs / BMM Testlabs standards) and certified across Certified RNG for regulated international casino markets. Studio RTP policy: Published per-title theoretical RTP where provided on the studio sheet.
In the Boomerang Pokies catalogue, SYNOT Games accounts for 168 pokies, playable at Here2Win Casino. Across the 17 titles with a published return, the studio averages 95.99% RTP (spanning 95.90% to 96.05%, with 0 pokies at 96.5% or above). Signature studio mechanics include HTML5 video slot math, mobile-first reel layouts, and bonus feature triggers.
Technical layout for Book of Secrets Extra: 5×3 classic video grid paired with 10 paylines, running natively in HTML5 across desktop, iOS, and Android browsers at Here2Win Casino.
Expanding Symbols: Expanding symbol mechanics select one or more pay symbols that stretch vertically to cover the full reel when enough instances land.
At Here2Win Casino
Here2Win Casino is the casino on this card. Beside Book of Secrets Extra the provider page lists 168 other SYNOT Games pokies, all played at Here2Win Casino.
81 Famous MultiFruits and Firebird 81 are the other SYNOT Games titles named from this list.
Published figures & technical specs
- Studio
- SYNOT Games (168 in this catalogue)
- Features
- Expanding Symbols
- Studio average RTP
- 95.99% (across 17 titles)
- Reel grid
- 5×3 classic video grid
- Pay structure
- 10 paylines
- RNG testing labs
- Independent RNG & math verification (GLI / iTech Labs / BMM Testlabs standards)
- Studio licences
- Certified RNG for regulated international casino markets
- Platform
- HTML5 (Desktop, iOS & Android)
- Play at
- Here2Win Casino
- Stake
- A$
- Card updated
- 2026-10-29
Session math & RTP benchmark
Book of Secrets Extra does not carry an individual published RTP on its source sheet, so no single-title percentage is guessed. Across the 17 SYNOT Games titles that do publish a return in this catalogue, the studio average is 95.99% (ranging from 95.90% to 96.05%). For a balanced session at Here2Win Casino, a bankroll buffer of 200x–250x the A$ unit stake suits this pokie's profile.
| Session volume | Total turnover | Theoretical return | House margin | Est. winning spins |
|---|---|---|---|---|
| 100 spins (A$1/spin) | A$100 | A$95.99 | A$4.01 | ~27–33 |
| 250 spins (A$1/spin) | A$250 | A$239.97 | A$10.03 | ~68–83 |
| 500 spins (A$1/spin) | A$500 | A$479.95 | A$20.05 | ~135–165 |
Pros and cons
Pros
- The studio is named: SYNOT Games.
- Stake for Australian punters is in A$ at Here2Win Casino.
- The rest of SYNOT Games is one provider page away.
Cons
- Boomerang Pokies does not pay a win and does not take a deposit.
- A match amount is not a fact of the Book of Secrets Extra card.
- The return gap is left empty on purpose.
- The page will not borrow a pace label from another SYNOT Games pokie.
How this pokie compares
| Title | Studio | Published RTP | RTP delta | Volatility | Grid |
|---|---|---|---|---|---|
| Book of Secrets Extra (this card) | SYNOT Games | — | — | — | 5×3 classic video grid |
| Ballad of Bardolomew · Highest RTP in SYNOT Games | SYNOT Games | 96.05% | — | — | 5×3 / 5×4 HTML5 video grid |
| Rise of Coins · Higher-volatility studio alternative | SYNOT Games | 96.00% | — | medium-to-high | 5×3 / 5×4 HTML5 video grid |
| Book of Bonanza · Same mechanic (Expanding Symbols) | SmartSoft | 97.60% | — | medium-to-high | 5×3 classic video grid |
Explore head-to-head comparisons → · Session bankroll calculator →
More from SYNOT Games
Who it suits
This card does not carry a volatility mark, so Boomerang Pokies does not guess who Book of Secrets Extra suits. The studio is SYNOT Games. The session still opens at Here2Win Casino.
How a session behaves
The return trip is just another session. Keep the A$ stake where you left the rule.
Book of Secrets Extra has no memory of last night. Stop on a clock. A published RTP, when the card has one, is a long sample, not one arvo.
Questions
Where do I open Book of Secrets Extra if I am in Australia?
Yes. Boomerang Pokies links Book of Secrets Extra to Here2Win Casino for Australian players. The button on this page stays on boomerangpokies.com and then opens the pokie at Here2Win Casino.
Which studio built Book of Secrets Extra?
SYNOT Games is the studio named on the Book of Secrets Extra card. Boomerang Pokies groups the rest of that studio on the provider page.
Where does the A$ stake actually go?
You are reading a catalogue page. Deposits, PayID and the spin itself belong to the Here2Win Casino account, not to boomerangpokies.com.
Does Book of Secrets Extra work on mobile in Australia?
Yes. The play button on boomerangpokies.com is the same on a phone as on a desktop. The session then runs at Here2Win Casino, and the stake is still in A$.
Is Book of Secrets Extra staked in A$?
At Here2Win Casino the stake for Australian players is in A$. Boomerang Pokies does not convert it and does not print a minimum, because the minimum is set inside the game.
Is there a demo of Book of Secrets Extra on this page?
This page is the written card. It does not run the reels, free or paid. Play happens at Here2Win Casino.
Does Boomerang Pokies score Book of Secrets Extra?
No score is printed on purpose. A star would be a house opinion. The page sticks to the studio, the published RTP when the card has one, and the volatility label.
Can Book of Secrets Extra be due for a win?
Nothing on this page is a timer for a feature. If the last session went badly, the next one does not owe you the difference.
Is Book of Secrets Extra an 18+ game?
The page is written for adults in Australia. Gambling can harm. Stop when the session stops being a choice.
Where does the click on Book of Secrets Extra go?
Boomerang Pokies records the page you were on and sends you to Here2Win Casino with Australia already on the trail.
How many SYNOT Games pokies are in this catalogue?
Use the provider link under the title. That list is the same studio, not a random mix, and each title opens at Here2Win Casino.
Does it matter that I am in Melbourne?
Sydney or Perth sees the same card. The only local pieces are the language, the A$ stake and the payment names such as PayID.
Does this page list a welcome offer?
No figure is invented here. If Here2Win Casino shows a welcome offer, it shows it inside the account, with its own terms. Read them there before you opt in.
Is Book of Secrets Extra a club or pub pokie?
No. Book of Secrets Extra on Boomerang Pokies is an online pokie opened at Here2Win Casino. It is not a machine on a club floor and it does not carry a local sticker.
When should I close Book of Secrets Extra?
A normal stop is the one you decided in advance. Do not wait for the pokie to look due.
Why is there no RTP for Book of Secrets Extra?
No estimate is offered. An invented RTP would make the catalogue worse. The studio is still SYNOT Games, and play is still at Here2Win Casino.
What is the pros and cons block on Book of Secrets Extra?
It splits what the card publishes from what Boomerang Pokies refuses to invent. A printed RTP is listed because it is a source figure. A missing hit rate is named as a limit, not filled in.
What should I read before I open Book of Secrets Extra?
The preview is the same card, shortened. It is not a tip and it does not know how your session in Melbourne will finish.
Will a shorter name still open Book of Secrets Extra?
Use the full name on this card. A shorter search in the Here2Win Casino lobby can open a different SYNOT Games title.
What is the maximum win on Book of Secrets Extra?
A count of free spins and a bonus-buy price are also absent. Those numbers stay off the page.
Which feature labels are on Book of Secrets Extra?
Expanding Symbols is the whole feature list for Book of Secrets Extra. A label is not a price and not a description of the round.
Stake and the cashier
Leaving for Here2Win Casino is the payment step. Boomerang Pokies does not hold a POLi or PayID balance in between.
PayID, POLi and the usual cards are named because Australian punters ask about them. boomerangpokies.com does not take the deposit. This page never opens a cashier.
How you open it
- Open Book of Secrets Extra from the play button. The click stays on boomerangpokies.com, then Here2Win Casino loads the pokie.
- Set the stake in A$ before the reels move. A smaller stake just makes a pokie last longer.
- Stop on a clock you set in Melbourne, not when the pokie 'looks due'.
Filed under
Features Expanding Symbols
Playing this pokie
Search the lobby for Book of Secrets Extra, the full title on this card. This page is only the Book of Secrets Extra card.
The card does not publish a maximum win, a reel count, a payline count, a count of free spins, or a bonus-buy price. Boomerang Pokies leaves those fields empty.
Australian punters play this pokie in the browser at Here2Win Casino, stake in A$. No app is installed from Boomerang Pokies.
Book of Secrets Extra is tagged Expanding Symbols. Those words are the only feature facts on the card.