Free slot: Book of 99

How Book of 99 works

Book of 99 is a very recent slot machine available at online casinos. It is published by the online gaming provider Relax Gaming since May 4, 2021. The game opens with a mysterious trailer that reveals a book engraved with the number 99. If the universe of this slot is a mix between the theme of Greek mythology and the traditional Book of machines, its main originality lies in its particularly high RTP (Return to Player) of 99 % (hence its name) and its WILD counter allowing to get the bonus game.

The rest is classic reel operation with 5 reels of 3 rows and 10 paylines. The reels are triggered and reveal different symbols. The payout ratio for Book of 99 is 99 % and it can be described as a high-volatility machine with a maximum payout of up to 12,075 times the original bet.

The different symbols of Book of 99

There are 10 different symbols that can appear on the grid:

• The book as a WILD and Scatter: it appears anywhere on the reels and substitutes for any other symbol. It also serves as a Scatter to trigger the free spins bonus feature when at least 3 of them are combined. Finally, each WILD landing on the reels during the base game increases the counter on the left of the grid by 1.

• A male character (pays x500 for 5 identical symbols) ;

• A female character (pays x200 for 5 identical symbols) ;

• A cyclop (pays x75 for 5 identical symbols) ;

• Lamia, the child-eating creature (pays x75 for 5 identical symbols) ;

• The classic symbols A, K, Q, J, 10 (pay x10 to x15 for 5 identical symbols).

The different connections in Book of 99

Only a few connections are possible in Book of 99. There are 10 paylines, which you can see in the image below. Whether they are lines, diagonals or simple buttons, you need to align between 2 and 5 symbols to get a win.

How the Book of 99 bonus works

The free spins bonus feature can be obtained in two different ways. When at least 3 Scatter symbols (the book) land on the reels in one game round, this bonus feature is triggered with 10 free spins awarded. These 10 free spins can also be awarded when the WILD counter is completely filled, i.e. when it has reached the number of 99 WILDs collected. An average of the bets played during the collection of the WILDs will be made before the free spins start in order to calculate the value of the free spins.

During the free spins, as is the case with the Book of machines, a symbol is chosen at random. Whenever this symbol is part of a winning combination during the free spins, it will spread across the entire reel for even greater odds of winning. Unlike the base game, the expanded symbols pay anywhere on the reels. Finally, additional free spins can be won during this bonus feature if, again, between 3 and 5 Scatter symbols appear.

Our opinion about Book of 99

With its new creation Book of 99, the online gaming provider Relax Gaming strikes a blow. With this 99 % RTP slot, the provider intends to attract a huge number of recreational players. Add to this the timeless Book of operation, particularly good graphics, a bit of Greek mythology and the assurance of getting the free spins bonus part at some point and quite quickly thanks to the WILD counter and you have a recipe for success!