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Agent 51

Review, Demo Play, Payout, Free Spins & Bonuses

Agent 51 is a video slot from Kalamba Games that is based loosely around a Book of mechanic. The slot has a fixed RTP of 96.17% and can be played from between 0.5 and 50 credits per spi...n. The game has a plethora of bonuses and features including free spins, expanding symbols, a multiplier and a base-game feature which triggers every 10 spins.

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  • Great base game feature
  • Top prize of 5593x
  • Minimum bet quite high


Kalamba’s Agent 51 is a highly-unique and fast-paced video slot offering you the chance to experience a relatively unique gameplay experience that differs from other “book of” games like Book of Dead from Play’n Go or Book of Ra Deluxe from Novomatic.

Format and Betting Options

Agent 51 is built around a 5-reel, 3-row format, and there’s a total of 20 fixed paylines; you’re unable to adjust the number of active paylines on each spin. You’ll find yourself able to spin the reels from between 0.50 and 50 credits per spin. So, while the minimum bet is a little bit higher than we’d like to see, it’s still a game that should be accessible to the vast majority of players.

Agent 51

Graphics and Theme

The game plays out in what looks to be a dimly lit office - and it really reminds us of something like Special Agent Mulder’s office, found in the popular series X-Files. The graphics are designed around a cartoon-like format - and while this isn’t something all players are a fan of, it actually works really well in Agent 51.

We love the graphics and visuals, and even better is the fact that the software provider has chosen not to use playing card values, including 10, jack, queen, king, and ace for the low-value symbols, instead using something a little different.

Agent 51’s RTP and Volatility

Agent 51 is built around a medium to high variance math model. In this slot, the top prize available is worth 5,593X your stake.

When it comes to the RTP of Agent 51, we’re pleased to see that Kalamba Games have chosen to build Agent 51 around a math model that’s higher than 96% - and the exact RTP of the slot is set at 96.17%.

Bonus Features

There’s quite a lot going on in Agent 51 - and the game developer has managed to incorporate a really neat little base-game feature called K-Loops alongside a free-spins bonus, both of which we’ll be taking a look at below.


This is arguably the most unique and distinctively creative feature you’ll find within Agent 51 - and it takes place within the base-game across all spins. Above the reels, you’ll notice that there are highlighted symbols - and these highlighted symbols transform into expanding symbols on every 10th spin.

If you manage to land the Polaroid accumulation symbol on an already highlighted symbol, then you’ll notice that there’s a multiplier increase coming into play - increasing the multiplier by 1X which is then applied against any and all wins.

What’s more, the expanding symbol does not need to land adjacent to the win on that 10th spin. However, in order to trigger it you do need to land at least two or more of the premium symbols anywhere in view - and it’s possible to transform up to 7 symbols into expanding symbols on a singular spin.

Free Spins

If you manage to land 3, 4, or 5 of the scatter symbols anywhere in view you’ll trigger the main free-spins bonus round. The scatter symbols are represented by the wild symbols - the Special Agent Wild - and like in all “Book of” slots, before the games begin a random symbol is chosen to become expanding. This symbol then expands during the entire bonus.

Now, during the bonus round, it’s also possible for you to land a UFO symbol anywhere in view. Doing so will award you with two additional free spins, and what we do like is that there’s no maximum limit on the number of spins you can win.

Agent 51
Max-win 5,593x
Agent 51
Volatility Medium
Agent 51
Top RTP 96.17%

Agent 51 Review

On the fact of it, Agent 51 is a very good-looking, well-made and enjoyable video slot. Kalama Games - the developer who’ve built the game - has done an excellent job in actually making the game, and we feel like it’s a really unique way of adding a wave of creativity into - what is, normally - a fairly generic math model. After all, “Book Of” games almost always feature around the same mechanic without offering much in the way of creativity.

The K-Loop feature within the base-game is really cool; not only does it offer you something completely different, but it also means that you don’t need to worry about landing the main free-spins bonus round in order to have the potential of forming big wins.

On the whole, it’s an excellent game - and when it’s available at more online casinos, we actually expect it to do pretty well with players. Remember, if you’d like to try Agent 51, you can play it for free right here at Slots Temple - without needing to risk any of your own money!

Disclaimer: Agent 51 trademark / license is owned by Kalamba Games. This site is not endorsed by Kalamba Games.

Slot Data
Slot Name: Agent 51
Software: Kalamba Games
RTP: 96.17%
Volatility: Medium volatility
Paylines: 20
Reels: 5
Min Bet (all lines covered): £0.50 (GBP)
Max Bet: £50 (GBP)
Top Win: 5593
Features: Wild Symbol, Free Spins, Medium volatility, High volatility, 5 Reels, Stacked Symbols
UK Available in UK? Yes. Kalamba Games have a UKGC license and are allowed to offer their games at UK licensed casinos.

What are the betting limits in Agent 51?

One of the things we’re always keen to see in an online video slot is a variety of stake options - ensuring both low-rollers and high-rollers can enjoy the action of the game. In Agent 51, for example, the minimum bet is 0.50 credits - which, while a little higher than we’d perhaps like to see, should suit the majority of players bar those playing on a super-low budget. When it comes to the maximum bet amount, Agent 51 offers a fairly high max bet - and you’ll find yourself able to wager as much as 50 credits per spin!

What’s the maximum win in Agent 51?

Agent 51 has a really decent maxim win - especially for a game that follows such a unique format and isn’t overly volatile. According to the game developer behind the slot - Kalamba Games - Agent 51 has a maximum win of 5,593X your stake, and this is pretty decent, especially considering the fact that the software provider are by no means mainstream, and many of their older games featured significantly lower RTPs.

What is the RTP of Agent 51?

Agent 51 has a fairly high RTP - one that’s much better than we see from the likes of many game developers in today’s fast-paced and intense online gambling world. The default RTP of Agent 51 is fixed in place at 96.17% - and from what we can tell, the game developer does not offer the slot in flexible RTP settings, meaning online casinos are unable to adjust the RTP - something that’s always a plus point for us here at Slots Temple.

Who makes Agent 51?

Agent 51 is a video slot from an up-and-coming game developer called Kalamba Games. While they're not one of the best-known companies in the online gambling industry, they’re working hard to push out a number of new slots, and their games tend to do pretty well, even though they’re not widely considered to be a mainstream software provider in the iGaming industry. Agent 51 is their latest release - and we think it’s fair to say that the software provider has really upped their game, given the fact that the graphics are superb, the game offers a high maximum win, and there’s tons of bonuses and features to look out for.

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    Overall score: 1.8 out of 5 stars
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