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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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.