Book of 99

Book of 99

The Book of 99 video slot by Relax Gaming gives players a different view of Greek mythology. It centers around the voyage of Odysseus trying to get back home after the Trojan War. This title includes great visuals, fun characters and a good mix of different features.

Rating: 85% | Made By Relax Gaming | Reviewed On

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An Introduction to Book of 99

After the Trojan War, the god Poseidon punched Odysseus by sending him far away from home. His journey back is one of the most important stories in Greek mythology. Relax Gaming has captured this journey in the Book of 99 online slot.

Book of 99 Main Screen
Book of 99 Main Screen

What stands out the most in this game is how they have mixed in different aspects of the story into the gameplay, which is something that you don’t see most software providers really make a priority.

As such, the gameplay here is really solid. The features aren’t super far outside of the box. However, they have been set up and framed in a way that fits this title perfectly. That’s on top of a pay table with a high hit-rate and a lot of balance. These are things that most players enjoy in most titles most of the time anyway.

Visually, this is a great title with a lot of aesthetic appeal. The monsters and characters on the game board look amazing. It’s definitely up there with some of the best we’ve seen in the sub-genre. The background is solid, and the map on the left-hand side of the reel is very fitting. It’s a part of a feature, but we’ll get into that further down below.

Betting and Layout

The format used in this title is pretty easy to just start out with. There’s nothing atypical to learn outside of seeing how the betting controls work. Here’s what to expect:

  • This is a game with five reels and three rows. It’s the most popular format used in video slots.
  • A total of 10 paylines are activated at all times. You cannot change how many lines are used.
  • All regular wins follow the paylines starting on the leftmost reel.
  • To make the betting simple, you’ll use an interface that expands over the reels. From there, you simply choose the total bet size that you want to make per spin.
  • A total of 19 bet sizes are available. They range from €0.10 at the low end to a maximum of €100

The payouts that we talk about here are going to be based on the total bet amount. However, if you want to know what they are based on line bet wagers, simply multiply them by 10. For example, if the win is 5x based on the total wager, then the line bet equivalent would be 50x.

Additionally, the volatility in this game is in the low range. However, there is a caveat to this, so you can’t necessarily adjust like you normally would. We’ll get into how this works further down below.

Gameplay and Features

The feature set of the Book of 99 video slot is all about giving players ways to get bigger pays. There’s nothing here that’s super far outside of the realm of normal. However, they do push the boundaries of the usual a bit. This ends with a position that’s like having one foot outside of the box with the other still inside. We like this dynamic because it makes the game familiar enough for players to be able to jump right in without it just being the same old, same old.

Book of 99 Free Spins
Book of 99 Free Spins

Wild Book Symbols

The book itself from the title is the wild symbol for this slot. It’s a leather-bound book with a somewhat gold appearance and red accents. It also appears on a blue or green mixed background. You can get payouts for wild symbols along the following lines:

  • Five of a Kind – 500x
  • Four of a Kind – 100x
  • Three of a Kind – 10x
  • Two of a Kind – 1x

Wins are always calculated on a per-payline basis. That means that you’ll get the best possible win on each individual line. As a result, you can have situations where you have two, three or four wilds, but you’re given a different payout instead on that line because it would be a larger individual win. While you get the biggest win available per line, you only get one prize per payline.

Free Spins Feature

The wild symbols also help to trigger free spins. If you get three or more of them on the game board, then you’ll be given 10 free spins.

These spins start by selecting a symbol at random to be the expanding symbol. This only happens during the free spins mode. After wins are calculated normally, they will expand to cover their respective reels. You’ll then get payouts for these expanded symbols only.

What’s really cool about the expanding symbols in the Book of 99 online slot is that they pay out even if they don’t land on consecutive reels from left to right. However, they are still paid out on a per payline basis.

Book of 99 Collection Feature
Book of 99 Collection Feature

Wild Collection Feature

On the left side of the reels, you’ll see a map with a counter. This counts the number of wilds that you get on the game board. Each wild increases the meter by one point. When you get all the way to 99, a set of free spins will be automatically triggered.

Note that your bet sizes can change without resetting this number. However, the game keeps up with the average size of your wagers in the meantime. It uses that average as the effective level of stakes when you trigger the free spins in this way.

How to Win at Book of 99

It’s really important for your RTP percentage that you finish out the meter on the left side of the reels. Those free spins are worth a lot of value, and if you plan on stopping with this title and moving on with another, it’s important to play through to 99 wilds if you want that value.

With that said, this game does have a low volatility. You would generally respond to that by increasing your bet size a bit. That range for a low-volatility title is often in the 50 to 67 percent range as far as the increase to your bet size goes. However, here you might want to go slightly smaller than that to make it easier to fill out the meter.

Payout Structure for Book of 99

The symbols in the Book of 99 video slot look great and have a sort of hand-drawn style to them. With the man in red, you’re getting the best regular symbol payout in the game with 500x for five. Five of the woman in purple gets you 200x as well. The cyclops monster and harpy (woman monster in purple) both pay 75x prizes for five.

Book of 99 Payouts
Book of 99 Payouts

Note that all four of these character symbols pay out for two of a kind or more.

You need at least three for the card rank symbol wins, however. The red A and orange K symbols both have the same payouts with 15x for five. With the purple Q, green J and blue 10 symbols, you’ll pick up 10x for five of a kind combinations.


The graphics level and feel of the Book of 99 online slot offers an aesthetically pleasing tone that’s competitive with much that the industry as a whole has to offer. Also worth noting, if excitement is the thing you’re needing in your slots, then you’ll really fall in love with the style of gameplay that this video slot gives to your play.

In addition to that, this video slot is an excellent part of this software company’s overall offering of slots because of its aesthetic appeal and gameplay style. The feature set offers a variety of various extra ways to win outside of the regular pay table, and the driving concept put into play as the center for this game is a great springboard for the gameplay style and excitement.


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