How Many Book of Ra Clones Are There?
We scored a Book of Ra style concept against 1,356 Ancient World slots. The closest match is 47.4% similar — and Book of Ra itself scores 43.2%.
Fewer than the question assumes, and that is the interesting part. Our catalog holds 1,356 Ancient World slots, and we classify the segment as crowded. But when we score a Book of Ra style concept — Egyptian tomb setting, a book that is both wild and scatter, free spins with one randomly chosen expanding symbol, 5x3 reels on ten lines, gamble feature — against every title we hold, the closest match scores 47.4% design similarity. Nothing in the catalog scores above 72%, the threshold where we would start calling a game a near-duplicate.
So the shelf is full of Egyptian slots. It is not full of actual Book of Ra copies. Those are two different problems, and only one of them is yours.
What the data shows
| Measure | Value |
|---|---|
| Ancient World titles in catalog | 1,356 |
| Of those, on 1–10 paylines like Book of Ra | 208 |
| Segment saturation | crowded |
| Closest design match to the Book of Ra pattern | 47.4% (Book of Lost Pyramid, CT Interactive) |
| Near-duplicates above 72% similarity | none |
| Average RTP in the 1–10 line segment | 95.73% |
| Average volatility in that segment | 4.76 of 5 |
| Average max win | 17,450x |
| Largest provider in segment | Pragmatic Play, 25 titles |
Where the closest matches actually land
The ten nearest titles to the pattern cluster between 35% and 48%. Nothing approaches duplication, and the reason is consistent: they share the theme and lose the structure, or share the structure and lose the theme.
| Title | Provider | Design similarity | What pulls it apart |
|---|---|---|---|
| Book of Lost Pyramid | CT Interactive | 47.4% | 5x4 reels, 10–50 lines |
| Book of Dead | Play'n Go | 44.6% | same layout and lines, different math |
| Ancient Egypt Classic | Pragmatic Play | 44.3% | higher RTP, different feature set |
| Book of the Pyramids | Zillion Games | 43.8% | 10–50 lines |
| Book of Ra itself | Greentube | 43.2% | 94.26% RTP, volatility 4 |
Read the fifth row again. Book of Ra scores 43.2% against the Book of Ra pattern. That is not a flaw in the scoring — it is the point. A faithful description of the design, scored against the original, still lands nowhere near duplication, because the original's own math (94.26% RTP, volatility 4 of 5) is no longer where this segment sits. The template everyone copies has drifted away from the games copying it.
What this means if you are greenlighting a game
The risk here is not that you will be sued for cloning Book of Ra. It is that the thing you think differentiates you — the book, the tomb, the expanding symbol — is the one part of your game that is genuinely generic, while the part nobody discusses in the greenlight meeting is where every competitor has already converged. In the 1–10 line Ancient World segment the average RTP is 95.73% and average volatility is 4.76 out of 5. There is almost nothing below volatility 4. If you ship at 95.7% and max volatility, your math is indistinguishable from 200 other titles and your only remaining lever is art budget.
The opening is in the math, not the setting. A 10-line Egyptian slot at volatility 3 with a real hit frequency is a genuinely empty shelf. A tenth expanding-wild tomb at 95.7% is not.
Method and limits
We score concepts against catalog titles by design similarity — math weighted 0.40, mechanics 0.35, theme 0.15, visuals 0.10 — not by name, marketing copy or publisher claim. Visual similarity is unmeasured for this concept, since we are scoring a text description against finished art, so all figures here rest on math, mechanics and theme. "Clone" is a structural description, never an infringement claim; two games can score 90% similar and both be entirely lawful.
What this does not show. It is not a revenue measure: we count titles, never GGR, and a crowded segment can be highly profitable. We hold no per-title performance data, so nothing here says which of these games actually earned. We also publish no year-over-year release counts for this segment, and that is deliberate — our catalog coverage before 2024 is materially thinner than after it, so a release-per-year chart would draw the shape of our own data collection and label it a market trend.
FAQ
So is Book of Ra heavily cloned or not? The theme and the book-scatter pattern are everywhere; exact structural copies are not. The closest match to the pattern scores 47.4%, and the original itself scores 43.2%. Most "clones" people mean are theme-mates, not design duplicates.
Is it still worth building an Egyptian slot? Only with a deliberate math position. With 1,356 titles in the theme and average volatility at 4.76 of 5, the setting is not a product decision — the math is.
Why do you not publish a hit frequency figure here? Because the field is sparsely populated across the catalog, so an average would describe the minority of games that report it while reading as though it described all of them.
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