Book of Ultimate Infinity

book of ultimate infinity reels

Provider: SG Digital

Release Date: 15/12/2020

Minimum Stake: 0.20p

Maximum Stake: £50

Featuring Bonus

About The Game

Infinity Reels are back, in a way that we haven’t seen them before. Combining the classic “book” slots with Reel Play’s Infinity Reels Mechanic, SG Digital are bringing us something that we haven’t seen before, which can be difficult to do these days. However different doesn’t always mean better, although we applaud the effort, and it will be interesting to see players’ views on a slot which uses one classic approach to slots, and one fairly new. Book of Ultimate Infinity can be played from 0.20p/c to £/€50, and has an RTP of 96.5%. Volatility is high, with multipliers of up to x48 on offer, expanding symbols in the bonus, and a bit of a grind to trigger the feature, so players shouldn’t expect to get anywhere quickly within this slot. Multipliers are active within the base game too, albeit without the expanding symbols, so this game does offer a chance for some pretty good wins while waiting for the feature. An overall cap of £/€250k on this slot means it does pack some serious potential, even if it isn’t immediately visible to every player.


When 5 or more identical symbols appear across 5 consecutive reels from left to right, each symbol used in a win will pay out their value once. At the lower end of the pay table, J, Q, K and A each pay 0.05x bet each time they are involved in a win. Once we reach the premium end, daggers and ankhs pay 0.1x bet each time they are used in a win. The Egyptian Queen Nefertiti and the gold statue are next in the line of the premium symbols, paying 0.15x bet and 0.2x bet respectively each time they are involved in a win. As expected, the highest paying symbol is the golden Pharaoh, paying 0.25x bet for each time it is used during a win. Although the pays are low, players should remember that multipliers are attached, incrementing for each extra reel added, both during the base game and the bonus.

The final two symbols available are the wild symbol, and the book symbol. The wild substitutes for all symbols except the scatter, or the expanding symbol during the bonus, and can appear on any reel except reel 1. The book symbol is the scatter, appearing on a randomly selected reel at the start of every spin, available to players in order to trigger the bonus.


For players who haven’t experienced Infinity Reels before, the concept is not a difficult one to comprehend. Originally pioneered by Reel Play, the screen starts with 3 reels, each containing 4 symbols. If players can match at least on symbol on every reel, a new reel is added to the right. For the duration of the spin, each time a symbol on the furthest right reel is involved in a win, a new reel is added. Sometimes, within the first 3 reels there will be two winning combinations, but only one continued winning combination on the furthest right reel is necessary for a new reel to add. In previous Infinity Reel Games, the reels have been capped at 12, where a jackpot was then awarded. Within Book of Ultimate Infinity, the reels are capped at 50. The first time a new reel is added, a multiplier of x2 is attached, and the multiplier continues to increment by 1 for the duration of the spin. Although reels are added provided 3 identical symbols land on reels 1-3, symbols don’t start to pay until at least 5 match up from the first reel onwards.

The base game on Book of Ultimate Infinity doesn’t have much to offer in the way of excitement, and ultimately is just a grind to get to the bonus. Unlike previous Infinity Reels offerings like El Dorado or Odin, the jackpot feature mentioned above is not available on this slot. Previously, players would have a countdown on the side leading to a jackpot, paying 888x bet, where 12 reels were needed in total. In Book of Ultimate Infinity, the jackpot countdown has been replaced by a countdown to the bonus feature. In a slot where a bonus should be a guaranteed feature, it’s not the most exciting move to remove the possibility of a jackpot for a bonus countdown. That said, the way in which the bonus is triggered is an interesting one, with no set amount of reels needed to trigger the feature. Instead, as mentioned before, a reel between 6-15 is chosen at random at the start of every spin, and a book is placed on that reel. Along the bottom of the screen is a map, showing players where the scatter is, meaning players will have to unlock anywhere between 6 and 15 reels to trigger the feature.

book of ultimate game play


Think Book of Dead meets El Dorado and you’ll get the bonus on this slot. Once triggered, 10 free spins are awarded, and one special symbol is chosen. During the bonus feature, if two or more reels contain the special symbol they expand, covering all positions and paying regardless of placement. In previous editions of Infinity Reels, players had to chance to gamble, or spin, for a higher incrementing multiplier within the bonus, and the jackpot was also active. Players must sacrifice these options in order to play with the special expanding symbols, and it will be up to each player to decide if that is worth it for them. Reels on Book of Ultimate Infinity are capped at 50, so not quite infinite, but certainly enough to offer some huge wins should players reach that 30+ multiplier on offer. During the Free Spins, a book symbol is placed anywhere from reels 9-15, and if players unlock the appropriate amount of reels, the bonus will retrigger. Should the bonus retrigger, the special expanding symbol remains the same, and landing a scatter symbol or expanding symbol on the right hand reel always adds another reel.

The interesting side of this bonus shows in the fact that the expanding symbol is not needed to land on consecutive reels to expand. Provided wins continue to add more reels, every special symbol that lands on any 2+ of those reels expands, so there is definitely the chance to expand on a lot of reels with a sizeable multiplier attached. Should players not be so lucky, with 10 free spins on offer, there is a good chance of a lot of small wins building up, ultimately forming a decent bonus, although perhaps not the most exciting to experience. However, unlike previous slots in this series, the multiplier is not sticky during the bonus, instead resetting for every spin.

book of ultimate bonus

My Thoughts

Whilst Book of Ultimate Infinity does combine some well known concepts in a new and interesting way, it slightly misses the mark in terms of what players would expect. Infinity Reels bring excitement to players with the chance of multipliers growing in increments bigger than 1, and “book” slots bring excitement because players can usually expect 4 expanding reels of a premium symbol to pay highly. By combining these mechanics, Book of Ultimate Infinity have had no choice but to decrease pays to allow the opportunity for the multi-reel potential combined with expanding symbols. Fans of Book of Dead might take issue with the low pays, and overall grind of this game, whilst fans of the Infinity Reels mechanic might not see the point in the expanding symbols. With previous Infinity Reels choices offering jackpots, and megaways, this slot seems like a step backwards rather than forwards in some ways. That said, we have seen a lot of classic remakes lately, and still see new “book” slots released regularly, so if this is SG Digital’s take on a classic, it is certainly an interesting one. We have no doubt that this slot will appeal to many players out there who appreciate the pick’n’mix of mechanics and potential in the slots they play. Overall, not a bad edition to the Infinity Reels catalog, but in our opinion not the most exciting in comparison to previous versions available.
An Interesting Take On A Classic
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