Switch to United States?

It looks like you are currently located in United States but browsing the GB site.

Switch to United States »
Casino Bonuses
Cover image
Ad Disclosure

Agent 51 slot review

Added by Kalamba Games. Information last updated: 30/03/2021

User rating:

- (0)

Expert rating:

4.3 (1)

Game information

Game supplier: Kalamba Games

Release date:02/2021



Max. win:bet x 5593

Mobile version:Support all devices

Play Agent 51



Bonus game or special game



Expanding reels





User ratings (0)

Game design:



Game sounds:

Mobile gaming:



Screenshot Screenshot Screenshot
RTP (Return to player):
Max. win:
bet x 5593

Bojoko score (compared to other slots on Bojoko)
Kalamba Games score (compared to other slots of supplier)

Expert's review Melanie Hart

Slot tested

The truth is out there and it’s time you learn all about it with Kalamba’s Agent 51. This 5-reel, 3-row slot with 20 paylines will reveal what you have known to be true for a long, long time. Aliens are real and Agent 51 needs all the photographic evidence to prove it. You are tasked with helping him take shots of the sneaky aliens. Do this, and vast riches may appear.

Aliens and sci-fi seem to be a popular theme nowadays and being a huge X-Files fan I was more than looking forward to playing this slot. Agent 51 himself gives me strong Fox Mulder vibes, so I’m not complaining. The ambience takes you straight into the twilight zone. Whilst the slot has a slightly dark theme with eerie music the aliens have a fun-like appearance to them so it’s not as creepy as you may think.

But the unexplainable is waiting at every corner and your trusty camera will help you uncover the mysteries surrounding you. It’s this camera that will bring about some interesting wins in the K-Loops and bonus rounds. This game has interesting mechanics with the base game operating on loops of 10 rounds. During the spin you will be collecting photographic evidence of the alien then on the 10th spin, any alien uncovered expands creating the win.


There’s a total of 10 symbols in play together with the Polaroid camera (appearing only on the 3rd reel) and the Wild symbol which also works as a Scatter. During the bonus round the Wild is taken out of the equation and instead, you may see a UFO which brings with it an extra 2 spins with every occurrence.

The symbols, from highest to the lowest consist of:

  • The scatter/wild tile can appear anywhere on the reels and can substitute for every symbol bar the camera. With 3 scatters the free spins round is triggered awarding 8 free spins. Five of these in any position will pay out 20x, on a payline they will pay 80x.
  • The yellow alien will pay 80x with 5-of-a-kind on a payline.
  • The orange alien will pay 40x with 5-of-a-kind on a payline.
  • The purple and blue aliens will pay 12x with 5-of-a-kind on a payline.
  • The yellow and orange alien footprints will pay 3x with 5-of-a-kind on a payline.
  • The brown, green and blue footprints will pay 1x with 5-of-a-kind on a payline.


  • K-Loops

The base game goes through 10 spin cycles called K-Loops. During spins, if the camera falls on the 3rd reel a shot is taken of an alien and is put on the bar on top of the reels called the Collection Meter. These are accumulation symbols and can also carry a random multiplier of x2 or x3. On the 10th spin, any of the accumulation symbols shown will expand to create wins anywhere on the reels. Lower paying symbols will only expand if there are 3 or more on the rows. Higher symbols will expand with just 2.

  • Free Spins round

Three or more Wilds will trigger the bonus round with 8 free spins. In the beginning, a random symbol is selected and put into the Collection Meter. The game then continues as normal with the goal to collect as many aliens in the meter to increase the chances of wins on every spin. During the free spins, a UFO may also appear on the reels giving out 2 extra free spins.

  • Hyperbonus

With Kalamba games there is no need to wait for the scatters to come up in the gameplay as you can fast forward to the bonus round immediately. However, keep in mind that you have to pay a hefty amount to do so which varies according to how many spins you start with.

In conclusion

The volatility in Agent 51 is cranked up to full (that’s a 10 out of 10). I’ve experienced this when playing and it took me by surprise. Whilst on the base game, during the K-Loops feature I won a jaw-dropping 480x. I wasn’t expecting such a win from normal gameplay but it happened. This is probably one of the big pluses of the game. Although wins in the base game only go up to 1,600x (compared to the 5,593x potential win in the bonus round), this still balances out the game nicely, with good wins happening during both base and bonus games.

I didn’t even come near such a win during the bonus round where I only managed a 28x win. This was slightly disappointing after the K-Loops win but that gives away the true volatility of the slot.

There is no doubt this game will be a hit with the pro-players who will want to chase the big wins. And it’s a plus that the game balances the wins throughout all of the gameplay. And with such a fun theme and a relatively good RTP, I can see this slot being a hit with the casual players too who want to try out the games’ mechanics for a little bit of something different.

Overall rating:


Play Agent 51 for free

Browse casinos with Agent 51 and other slots from Kalamba Games. Create an account and try the game for free before making a deposit.

  • Tebwin review »
    Play here »
    Number of games: 1230
    1st deposit bonus: 200%/£50
    +18, new UK players only, be GambleAware | Full apply
  • Dream Vegas review »
    Play here »
    Number of games: 2300
    1st deposit bonus: 100%/£300 + 150 bonus spins
    +18, new UK players only, be GambleAware | Full apply
  • Features

    Wins and bets

    RTP (Return to Player):96.17%


    Max. win:bet x 5593

    Min. bet:£0.5

    Max. bet:£50

    Progressive jackpot:

    Reels & playlines



    Non-standard layout:

    Max. lines:20

    Min. lines:20

    Win both ways:

    Other features


    Expanding reels:

    Stacked symbols:

    Colossal symbols

    Auto play:

    Turbo play:

    Quick play:

    Virtual reality:

    Bonus features

    Bonus game:

    Random bonus:

    Progressive bonus:

    Buy bonus:

    Free spins:

    Scatter symbols:

    Bonus game symbols:


    Standard wilds:

    Sticky wilds:

    Walking wilds:

    Stacked wilds:

    Random wilds:

    Multiplier wilds:



    Walking re-spins:

    Sticky re-spins:

    Cascading reels:

    Sticky wins:


    You can play Agent 51 in English, Finnish, Swedish, German and 9 other languages.

    All supported languages:
    English, Finnish, Swedish, German, French, Spanish, Italian, Russian, Czech, Danish, Norwegian, Portuguese


    Agent 51 supports GBP, EUR, SEK, NOK and 8 other currencies.

    All supported currencies:
    GBP (£), EUR (€), SEK (kr), NOK (kr), DKK (kr), RUB (₽), USD ($), NZD ($), CAD (C$), AUD ($), mBTC (m฿)


    Release date 02/2021
    3rd newest on Kalamba Games 144th newest on Bojoko
    RTP 96.17% 0.13% > average
    11th highest on Kalamba Games 652nd highest on Bojoko
    Win up to 5593 x your bet
    10th highest on Kalamba Games 430th highest on Bojoko
    Paylines 20 0% < average
    11th highest on Kalamba Games 578th highest on Bojoko
    Min bet £0.5 per spin
    5th lowest on Kalamba Games 1,165th lowest on Bojoko
    Max bet £50 per spin
    8th highest on Kalamba Games 930th highest on Bojoko
    Rated 0 by 0 members
    The most rated on Kalamba Games 38th most rated on Bojoko
    12 more slots listed by Kalamba Games

    Similar slots

    Firedrake's Fortune RTP: 97.44% Max. lines: 40 Volatility: High
    Joker Leprechauns RTP: 97.42% Max. lines: 40 Volatility: High

    Expert's profile


    Melanie Hart

    Melanie Hart

    Mel has been writing for the past decade covering anything tech from software to gaming. Poker is her card game of choice, and she does enjoy feature-rich slots, but her real passion is competitive FPS games.

    Latest reviews:
    Agent 51 cover

    Game supplier:Kalamba Games

    Release date:02/2021

    RTP (Return to player):96.17%

    Max. win:bet x 5593

    Mobile version:Yes

    User rating: 0
    Expert rating: 4.3

    User reviews

    Help others by rating Agent 51

    Game design:
    Game sounds:
    Mobile gaming:

    Say "OK" to the cookies. Learn more in our privacy policy.