IO slot review (Elk Studios)


IO is a futuristic slot, where symbols are dropped into space. In space, you’re trying to get a foothold: when you run out of gravity, you’re going to float. Yes, it’s something you want to prevent from happening. Luckily you can, if you play io, thanks to the many features and wild symbols. These help you on your way to winning fantastic prizes.

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Release Date:
June 2020
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Elk’s IO slot – are you going to lose your gravity in space? Or are you going to keep your head cool and get a massive prize?

Software: Elk Studios

Paylines: 4,096 up to 262,144 ways to win

RTP and variance: 96.0%, Medium to High variance

Maximum win: 5,000 x the total bet, or $€0.5 million

Betting range: $€0.20 – $€100

Bonus features: Free spins, many kinds of wilds

Casino Hipster verdict: Hot!

IO has a short name, but the wins can be big – up to 5,000x the bet here

Or, if you’re betting a maximum of one hundred, a more than cool half a million! Are you going to go into space and find that luck? WHO KNOWS! 

IO slot – Gameplay and Features

You start with 6 reels with 4 rows of symbols. We say rows, but the symbols go up and down and sideways. But if you ignore that, you see that there are four rows.

The game is played according to the win all ways mechanism. As there are 6 reels with 4 rows, there are 4,096 ways to win. That can go all the way up to 262,144 ways to win if you get the maximum number of 8 symbols on all 6 reels (8x8x8x8x8x8=262,144).

In the game, you also have the Avalanche mechanism, where winning symbols disappear. But the nice thing here is that a full row of symbols will be added for the next re-spin. For example, if you get a few consecutive winning combos, you will notice that there are many more symbols in the “space,” leading to many more ways to win.

But there is more.

There are several wilds that can be very lucrative.

You have the Regular Wilds, which change in every symbol except the bonus symbols.  Nothing special, but useful.

Then, there are the Charged Wilds, who have 4 “lives”. You use such a wild 4 times to make a winning combination because these wilds only lose a life if you spin a winning combo. If not, the lives are kept.

There are also the Wild Forges, which are wilds with a multiplier. Every time such a wild is part of a winning combo, the multiplier increases by +1. It can go up to x20. If you get a nice series of consecutive wins, it can become highly lucrative.

But we’re not there yet.

There is also a Laser Symbol. Do you have 2 of them, then all the symbols between these 2 Laser Symbols are converted into wilds. With the win all ways concept, these Laser Symbols can create a lot of fireworks. In terms of prizes, I mean!

The free spins – you start with 262,144 ways to win.

Grab your 3 Bonus symbols and activate the seven free spins. Elk Studios calls these Free Drops by the way.

The big advantage of the Free Drops is that you start with a fully filled “space” of 6 reels with 8 symbols each. Yes, that implies that you get the maximum of 262,144 ways to win.

Payout percentage (RTP)

The payout percentage of IO is 96.0%. It is just about okay, but of course not spectacular.

The variance (volatility) of IO is medium to high

Elk Studios gives a score of 8 out of 10 for the volatility of io. This means that the variance is medium to high.

Most major top prizes will be around 500x to 1,000x the bet. Chances of winning anything more substantial will be very, but very small, but not impossible.

Other Elk Studios slots with similar volatility are Hidden, Wild Toro, Cygnus or Ice Wolf.

IO slot – pros and cons of this slot



  • Beautiful theme and very original.
  • Fantastic boosters with the wilds and laser symbols.
  • More than enough fireworks.
  • The prizes you can win here are by no means childish.


  • You’re taking quite a risk with this slot. If you don’t land the big win, you will probably end your session with a loss.
  • The io slot is very similar to Cygnus.
  • You can get dizzy from the symbols.

IO slot – who will like the slot? And who won’t?

Players who appreciate a beautiful and original slot will not skip this slot. In one word: stunning! You have to dare to take some risks because this slot is quite volatile.

It is better to stay away from this slot if you suffer from dizziness or get over-excited easily.

Available in your country
  • 🤑Crypto-friendly
  • 📱Mobile app
  • 🚀Leaderboard feature
Let's roll Review

It has a wagering requirement of 60x and I have to say that the bonus terms and conditions are not fair, 60x is an above the standards, so be aware before you deposit for welcome bonus.

Bonus Info & Terms
  • ⚡️Fast deposit and withdrawal options
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Let's roll Review

Note that the deposit + bonus amount is subject to a 35x wagering requirement for any winnings to be withdrawn. Ensure you complete the wagering requirement within the 30-day validity period. Slots contribute 100%, and table games and video poker contribute 10% to the wagering requirement.

Bonus Info & Terms
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Let's roll Review

You need a minimum of $20 to claim the offers. Additionally, if you can deposit $100 or more for your first deposit, you can claim up to 100 free spins to play the Hot Lucky 7s slot.

Bonus Info & Terms
  • 🤑 No-deposit bonus
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Let's roll Review

The minimum deposit for the welcome offer is $50, which is a bit higher than most other online casinos I gotta admit. However, if you don’t mind the steep deposit, you can get a pretty decent starting bonus to try out what this casino has to offer.

Bonus Info & Terms
  • ✅ 24/7 Customer support
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Let's roll Review

The wagering requirement must be beaten in 90 days to win and withdraw the bonus fund. All games except jackpot slots contribute to the wagering requirement. Slots contribute 100%, Keno contributes 50%, and Video Poker contributes 20%.

Bonus Info & Terms
  • 🤑 Crypto-friendly
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Let's roll Review

The qualifying minimum deposit for these welcome bonuses is capped at $25. It’s important that you redeem the code before you make these deposits for the bonus to be valid. In addition, you must beat the wagering requirement of 25 times before you can withdraw the bonus funds on any deposit.

Bonus Info & Terms
  • 🚀Innovative games
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You can take advantage of the rewarding promotions the operator offers, provided that you’re consistent on the site.

Bonus Info & Terms
  • 🤑 Exciting bonuses
  • 📱 Mobile-friendly
  • 🚀 Massive game selection
Let's roll Review

The minimum qualifying deposit you must make to claim the bonus is €20, while the wagering requirement to fulfil to keep winnings made from it is 40x. Once the bonus is added, you must use it within 30 days to avoid forfeiture.

Bonus Info & Terms
  • ✅Crypto Casino
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Let's roll Review

Deposit: Does not require a minimum deposit Bonus Match Percentage: 110%, 50%, 75%. Maximum Bonus Value: 1 BTC (and Cryptocurrency equivalent) or 100 EUR (and FIAT equivalent) No Deposit Free Spins: 50 Free Spins Free Spins: 300 Free Spins Free Spins Slot Game: Princess of Sky, Brave Vikings, Book of Pyramids, Cherry Fiesta, Desert Treasure, Lucky Lady Clover, West Town, Lucky Blue, Princess Royal, Hawaii Cocktails Bonus Wagering: 35 x Bonus Free Spins Wagering: 40 x Free Spins Remarks: 250 Free Spins offered as part of the 1st Deposit Bonus will be rewarded in a set of 50 spins for 5 days. Minimum deposit required for the spins is 0.05 BTC (and Cryptocurrency equivalent) or 50 EUR (and FIAT equivalent). Full T&C Apply. 18+

Bonus Info & Terms
  • 🎁 Multiple bonus offers
  • 🤑 Crypto gaming experience
  • 📱 Mobile compatible site
Let's roll Review

The bonus has a 45x wagering requirement and a minimum and maximum bet of €0.50 and €5. In addition, the bonus is only eligible for games from EGT, Amatic, and NetEnt, and it can’t be used with other promotions. Keep in mind that the 45x wagering requirement can be challenging for newbies.

Bonus Info & Terms