Book of 99 by Relax Gaming is a 5-reel & 3-row online slot with 10 paylines and a 96.50% RTP. Playable on all devices from €0.1 to €100 per spin, Book of 99 is a medium volatility game with a max win capped at 12075x your stake.

Tip: View our Relax Gaming slots page for a complete list of all their titles.

Where to play

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  • First-ever slot with a 99% RTP

The Greek odyssey warrior theme is not what we expect when we think about the “book of” series. The reels are set on a concrete temple, with one of the pillars displaying a map and a collection meter. You can find out more about this feature in the “Special Features” section below.

How to win big on Book of 99 - Free Spins

book of 99 fs trigger

To trigger the free spin players are required to land 3 or more wild symbols on the reels. Once the feature is activated 10 spins will be granted.

book of 99 free spins expanding

Before the feature begins a special expanding symbol is randomly selected. If the special expanding symbol lands during the free spins, it has the ability to pay out on all 10 lines maximizing the players chance to land a juicy mega win.

Additional features

  • Collection

book of 99 collection

The wild symbol is represented by the famous Book. For each wild that lands on the reels will increase the collect meter by 1.

Landing 99 wilds will trigger the free spins feature. Free spins which are triggered by the Collection feature are played using the bet size corresponding to the average of the bet sizes used when collecting each Wild.

Once the spins come to an end, the Collection Meter will return to 0.

Look and Feel of Book of 99

As soon as I heard the slot title starting with “book of” my initial thought was “yawn.. Another one?!”

However, it was a pleasant surprise to see that Relax had taken a different approach with the slot, moving away from the Ancient Egyptian theme. The four highest paying symbols are illustrated by different characters, whereas the lower paying symbols are standard 10, J, Q, K and A, as displayed below in the image.

book of 99 paytable

Landing three or more wilds was not an easy challenge to trigger the free spins round, although filling the collection meter was fairly plain sailing.

As one of the first slots to offer a 99% RTP it enhances the joy factor and makes you just want to keep spinning those reels! Whether you are sick of the “book of” series or not, Book of 99 is a unique slot and is worth giving a spin just because of high RTP!