IO Slot Review

After the creation of the Egyptian-themed slot Cygnus, ELK Studios prepares a second one. It also uses the same Gravity mechanic. IO is an intergalactic adventure in search of precious minerals. It will entertain you with avalanches, free drops and sticky wild symbols. The win ways are between 4,096 and 262,144.


IO Overview


IO is unique, original and includes the Gravity mechanism for the avalanches. The game can offer you 3 different wild symbols, a Laster feature and Free Drops that play on the largest 8×8 grid. ELK Studios plan the game’s release for the 2nd of June 2020. Have a memorable journey travelling to visit the planets and good luck!

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Game Type:

Video Slot

IO Details

  • Software:
  • Bonus Game:
  • Yes
  • Progressive:
  • No
  • Paylines:
  • 262144
  • Wild Symbol:
  • Yes
  • Reels:
  • 6
  • Scatter Symbol:
  • Yes
  • Autoplay Option:
  • Yes
  • Multiplier:
  • Yes
  • Min Coins Size:
  • 0.20
  • Free Spins:
  • Yes
  • Max Coins Size:
  • 100.00
  • Jackpot:
  • 5,000x bet

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IO Review Review

The game uses 6 reels, 4 rows and 24 symbols land per spins. There are 4,096 ways to win. Winning symbols trigger an avalanche and each one adds one more row. The grid consists of 6 reels, 8 rows and offers up to 262,144 ways to win. You win when you land 3 or more matching symbols on consecutive reels from left to right. They can appear on any row as long as they are on successive reels and start from the first one. This lets you have more chances for wins.

Play with wagers of 20p to £100 this high volatility slot with an RTP of 96%. The hit frequency is 24.6%. IO includes 3 different wild symbols. Two of them trigger the Wild Forge and the Charged Wild features with increasing without limits multiplier wilds. The Laser feature destroys symbols and adds wilds. The Free Drop Bonus gives you between 7 and 15 rounds and you play it on an 8×8 grid. This is the maximally expanded grid with 64 symbols per spin. The Charged Wilds and Wild Forges are sticky symbols during them. The jackpot win in IO is 5,000 times your stake.

The Design

The game is neon-lit and takes you on an intergalactic casino journey to Jupiter. The theme is science-fictional with a casino space station. You will be travelling to the borders of the solar system. Your task is to collect precious minerals from the moon. All symbols are encompassed in round discs. On them are displayed card royals and some classic images of stars, 7s, clovers and etc.

The background shows the outer space with stars and other intergalactic objects. The colours are fluorescent and glowing. The soundtrack is cosmic and melodic, very suitable for an outer space adventure. The game mechanic is unusual as is its cosmic design and the implementation of the theme.

IO Review Gameplay

To win in IO you need 3 or more matching symbols landed on next to each other reels. The exact position of the identical symbols on the rows is of no significance. Winning symbols vanish from the screen as an Avalanche mechanic comes into play. Since there are 6 reels, 4 rows and 24 symbols per spin as default, the maximal achievable wins ways are 4,096 in the base mode.

When you get an avalanche, the winning symbols disappear. New symbols gravitate into the gaps, which gives you a great chance for scoring more wins. The difference in this game to most slots is that the Gravity mechanism is applied. Thus, rows do not sit flush. When the new symbols move to the empty spaces, they fall either left or right according to gravity.

Another beneficial booster is that each avalanche adds one extra row. A maximum of 8 rows is possible to be created. When you reach the 6×8 grid, the win ways become 262,144. Avalanches give you chain reactions as gaps are filled by the proper symbols. The next spin begins when no more chain wins occur.

The symbols include 8 regular ones that can be grouped into low and high paying ones. The low-value ones are the round discs that display the J, Q, K and A card royals. Six J symbols pay 0.20 times your bet.

There are premiums such as stars, clovers, diamond and lucky 7s, all encompassed in discs. The pink 7 is the most rewarding symbol and 6 of it on successive reels pay 5 times your bet.

IO has 3 different wild symbols and they all substitute for missing symbols. These are the standard, Charged and Forge Wild. There are also laser and bonus symbols. These two trigger their respective feature and bonus round.

IO Review Features / Bonuses

The extra features in IO are triggered by the 2 extra wilds mentioned above. One of them is the Charged Wild that starts with 4 lives. This wild symbol remains on the reels through the whole reaction sequence. Every time the Charged Wild takes part of a win, it consumes and loses one of its 4 lives. When all 4 lives are used up, the wild leaves the grid.

The second extra is the Wild Forge symbol. This one you may have recognised from the Voodoo Gold and Tahiti Gold slots. When this symbol appears, it fills an empty space under it with a multiplier wild. The value of this multiplier increases every time the Wild Forge is used. The good news is that there are no set limits on how high the multiplier can reach. When the Wild Forge lands on the bottom of the grid, it turns into a multiplier wild itself.

Your ultimate goal is collecting precious minerals to win big. So, you have another feature to help you. The Laser feature is very useful as every time the laser symbols appear on the grid, they shoot a beam of light. These shots destroy the lasers along with any regular symbols on their path. This lets new symbols occupy the empty spaces and gives you more chances to get wins. You may have two intersecting beams of light from the laser symbols. Then, as a result, all symbols along the beams up to the point of intersection turn into wild symbols.

And last but not least, there are bonus symbols. Landing 3 of them in a spin sequence triggers 7 Free Drops Bonus Game. In case you got 6 triggering bonus symbols you will be rewarded with 15 free drops. You can retrigger them and add more free drops.

During these rounds, the grid expands to an 8×8 size. This means that you will relish in more winning ways. Also, any Wild Forge or Charged Wild symbols landed become and remain sticky symbols. You will see them at the bottom of the grid between spins throughout all drops. the chances for scoring the jackpot of 5,000 times your stake per spin are the largest during the free drops.

The Conclusion

IO is fun and has a cosmic atmosphere. It lets you experience a virtual journey to distant planets. The variety of features is really good. The sticky and multiplier wilds, free drops and the transformation of symbols ensure abundant payouts. The max win per spin sequence is 5,000x stake. The multiplier wild’s value isn’t capped, so if you have the luck, you can be richly rewarded. Wait for IO’s release and spin the reels!

IO Theme

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Your Review on IO

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Casino review by


Date: 10 February,2021

Hey there, I'm George, an old-school slots enthusiast and gambling expert. I've been passionate about slots, poker, and online casinos for years, and I love sharing my knowledge with others. Whether you're a seasoned player or just starting out, I'm here to help you with any gambling-related questions you may have. So, feel free to reach out to me anytime!