Checked against Relax Gaming’s Book of 99 product page on 19 August 2026.
Official fun mode
Book of 99 Demo — Play Free, No Download
Play Book of 99 with demo credits in your browser. No registration, deposit or download is needed: load the game below to explore the reels and 99-Book collection meter.
Ireland edition
Ireland’s new licensing regime is opening in stages.
GRAI began accepting remote betting applications in February 2026. A betting licence should not be assumed to cover every online casino game or operator.
en-IE · EUROpen the Ireland demo guide
Official Relax Gaming launcher
Official fun mode
Open the real Book of 99
The game loads only when you choose to start it. No account, deposit or real balance is used inside this page.
Free slot demo
Play here, then check what you learned.
Choose “Load official demo” to launch the game inside this page with play credits. No casino account or software download is needed here. If the launcher is unavailable in your location, the rules and paytable guide remain available.
Check the published RTP and paytable →A purposeful test
Four checks inside the demo
Random demo spins are not a statistical test. Use the session to inspect the interface and the rules the game actually presents.
- Open the paytable at the displayed demo stake and compare the regular-symbol values.
- Confirm the RTP, stake range and maximum win shown by the version available to you.
- Watch the left collection rail move whenever a Book wild lands in the base game.
- If Free Spins open, record the selected symbol, its expansion threshold and whether a retrigger appears.
RTP99.00%
Maximum win5,000×
Reels5 × 3
Paylines10
Bet range€0.10–€100
What it can verify
A real interface and readable rules.
- Reel layout, controls and help navigation.
- The collection rail and both feature descriptions.
- The RTP and limits displayed by the loaded game version.
- How the expanding symbol is presented when the feature appears.
What it cannot prove
Your future return or feature frequency.
- A short run cannot estimate personal RTP.
- Demo credits cannot show how a cash loss will feel.
- Recent spins do not make a Book, feature or win “due”.
- The launcher cannot verify a casino’s withdrawal or bonus terms.
Desktop and mobile
The game is browser-based; the surrounding controls may change.
On a narrow screen, open the game menu before the paytable and collection help. Landscape view may give the reels more room, while portrait view keeps the launcher easier to read. The casino wrapper can differ from the publisher demo.
VerifiedThe guide verifies the Relax Gaming fun-mode launcher, not a standalone Book of 99 app.
Continue with the full round walkthrough →
Player questions
Book of 99 demo questions
01Can I play Book of 99 without registering?+
The fun-mode game on this page uses play credits and does not require a casino account or deposit. Cash play is separate: availability, account checks and payment terms belong to the platform you choose.
Learn the controls02Why does the demo show a blank screen or keep loading?+
The game is supplied by Relax Gaming inside this page. A connection problem, browser setting or location restriction can prevent it from starting even when it works for another visitor. Close the demo and load it once more. If it still fails, try an up-to-date browser or return later; do not deposit money to solve a demo loading problem.
Read the rules and paytable while you wait03Do I need a Book of 99 app or APK?+
No download is needed for this browser demo. Open the game here on desktop or mobile. A casino app, if offered by a platform, is a separate product; a file using the slot’s name is not proof that Relax Gaming published it.
Find the game menu and help04Can I withdraw the demo balance or keep its collection progress?+
Demo credits have no cash value and cannot be withdrawn. Do not expect a demo balance or collection counter to transfer to a real-money account. Before leaving a paid game, check its own help and the platform’s session rules.
Understand the 99-Book counterWhat we verified
Claims tied to visible evidence.
Published specifications establish the numbers. The live fun-mode help screens establish how those numbers and feature rules are presented to a player.
Checked inside the official fun-mode launcher and retained as dated help-screen evidence.
See the rule walkthrough →The original announcement documents the launch positioning and the 99% return figure.
Before paid play
Keep the rules, not a promise of wins.
Set a cash limit and a time limit before a paid spin. Do not increase either limit because the collection counter is close to 99.