About the Editors, Their Sources and Their Funding
Book Slots covers 9 slots from 7 different studios that happen to share a shelf and a naming habit, across 17 pages in 3 sections. It is organised by genre rather than by studio for one reason: readers compare these games against each other, not against the rest of a developer's catalogue. The studios behind them also disagree sharply about how much they are willing to publish. One prints five return configurations in a public document. Another prints no figure at all.
- What this is
- An independent catalogue of Book-titled slots
- Titles covered
- 9, from 7 studios
- Pages
- 17, in 3 sections
- First published
- How it earns
- Affiliate commission on links marked sponsored
- What it is not
- Not a casino, not a studio, not a game's official site
Table of contents
Why a Genre and Not a Series
These games are not one series. Book of Dead belongs to Play'n GO, Book of Ra to Greentube, Book of the Fallen to Pragmatic Play. The resemblance between them is a theme and a naming convention rather than shared code. Grouping them by studio would split exactly the comparison a reader is making. Two of these names get typed into a search box on the same evening.
It also puts a useful contrast in one place. The published returns on this shelf run from 84.18% to 99%. That is the house keeping anything between a hundredth and roughly a sixth of every stake, and two of the nine titles publish no return whatsoever. You cannot see a spread like that from inside a single developer's lineup.
One warning about names, since this site is built on them. Book of the Dead
with the article is an Egyptian funerary text. It has nothing to do with any of these games, and the slots drop the article. Anyone who arrived here looking for the papyrus is in the wrong place, and we would rather say so than keep them reading.
Where Every Figure Comes From
Four kinds of source carry weight here, in this order, and a page says which one it is leaning on. A figure with no source behind it does not get printed - the gap gets printed instead.
| Source | What it settles | How strong it is |
|---|---|---|
| The studio's own demo client | Paytables, rules text, bet floors and stops, feature prices, build numbers | Strongest: read first-hand, with a frame to show it |
| The studio's own page or document | Return versions, win ceilings, release dates, volatility ratings | Strong, but single-source - a party describing itself |
| A licensed casino that must publish | The return of the build that casino actually runs | Useful exactly where a studio stays silent |
| A regulator's register | Supplier licence numbers and their current status | Decisive where a page turns on one; so far that is Play'n GO, read in the Maltese and British registers |
The order matters more than it looks. Playson's two clients name no return and no ceiling anywhere in their rules screens, and its own game page prints neither either, so for Book of Gold: Classic there is no figure to quote at all. Greentube publishes neither, which is why the Book of Ra pages here quote casinos instead. Admiral Casino UK printed 92.13% for Book of Ra Deluxe on . An archived Grosvenor Casinos page from printed 94.26% for the same game. Both numbers stand, each with the name of whoever published it.
How the Site Earns, in Plain Terms
Some links to casinos here are affiliate links and are marked sponsored. If a reader signs up through one and deposits, this site may be paid a commission by that casino. Nothing else funds it. No studio pays for coverage, no casino buys a position in a list, and no score has ever been adjusted after a conversation with anyone.
The protection against the obvious conflict is structural rather than a promise. Scores are the plain average of five published criteria that measure how much a reader can verify before depositing, so a generous commission cannot move one. The only way to raise a score is for somebody we accept as a source to publish more — the studio, its client, a licensed casino or a regulator's register. A game whose studio stays silent about its return scores badly here however popular it is, and that is the whole design.
Four Gaps This Site Has Not Closed
Naming these is more useful than hiding them, and each one is a limit on what you should take from these pages.
| Gap | Why it exists | What it means for a reader |
|---|---|---|
| No casino reviews yet | An operator page needs a dossier of checked numbers, and none is built | Where to play is not answered here - the game pages stop at the game |
| 4 titles with no session behind them | Greentube's server answered 401 to the one anonymous request we made, and serves no demo a reader can open; Nolimit requires an account; Games Global serves no demo for Book of Oz | Those pages rest on what others publish, and where nobody publishes anything they say that instead |
| Nothing checkable published by one studio | Greentube publishes a game page with a volatility band and a free-spins rule, and closes return, ceiling, licence and certificate behind 'Client login for more data' | Its figures are a casino's figures, dated, not the studio's |
| No real-money play | Testing runs in free demos, which measure no return anyway | Nothing here reports what a funded session felt like |
Independence, Stated Flatly
This is a review publication. It runs no casino, holds no player accounts, takes no deposits and has no connection to any of the seven studios whose games it covers. Each game name is its studio's trademark, used here to identify the game under review. Where a page is about one named game, the notice and the denial of affiliation sit beneath it. A page that compares several games cannot attribute one trademark, so it names the publisher beside each figure instead and leaves the notice to the game's own page.
Screenshots are our own captures from the studios' free clients, reproduced to show what a screen prints. The logo, the page design and every word of the writing are ours. Everything here is written for adults of 18 and older. If gambling has stopped being a game for you, the help page lists free services that are not tied to any operator.
Frames from the Clients That Opened
Pragmatic Play's client for Book of the Fallen prints both paid prices, the paytable in money and the cap with its consequence, all on its own screens. That is why its screens sit beside this account of where the figures come from.
Deposits and identity checks stay on the operator's own secure site.
Related Reading
Elsewhere in this catalogue, from the same section first:
