Io Slot

Review, Demo Play, Payout, Free Spins & Bonuses

6 Votes
2.8out of 5 stars
Io is an ELK Studios slot that features an exciting format with expanding reels and up to 262,144 winning ways. The game offers a top prize of 5000x, and there are several innovative bonuses available that add multipliers and transform symbols - along with a free spins bonus. The RTP of this high volatility (8/10) slot is 96%.


Io is a space-themed online slot from ELK Studios with a format similar to Cygnus. Its unique avalanche feature provides you with the chance to trigger up to 262,144 winning ways and there are three base game features along with a free spins round to help you land big wins. A wide betting range is available from .20 coins to 100 coins per spin. Io isn’t yet available at online  casinos (it will launch on June 2nd), but you can play the demo slot for free here at Slots Temple.

Theme and Graphics

Io is a futuristic spaced-themed online slot that takes place against a dazzling backdrop of stars and Jupiter. There’s even a bit of a narrative, as we’re supposed to be aboard a casino’s space station that’s headed for Earth – but the vessel is denied entry. Instead, it sets a course to Jupiter and is drawn by gravity to the planet’s fourth largest moon, Io. It’s great that there’s a backstory and we love the look of this slot, and both aspects work together to create an engaging gaming experience.

Io Slot

RTP and Variance

The RTP (return to player) of Io from ELK Studios is 96%. It’s also a higher volatility slot – an 8/10 on ELK’s volatility scale – with a top prize worth 5000x your stake.

How to Win

To hit winning combinations in Io, you have to land three or more matching symbols on adjacent reels. The 7 is the most generous symbol in the game that provides you with a 5x payout for 7-of-a-kind.

Whenever you hit a winning combination, the gravity mechanic comes into play. Instead of a normal cascade, where the winning symbols disappear and new symbols fall into their places, the remaining symbols roll either to the left or right of the game. Then, more symbols fall on to the screen to create additional winning ways – up to a maximum of 262,144. It’s similar to the mechanic in Cygnus so, you’ll enjoy this slot if you liked that previous ELK release.

Free Spins and Bonuses

A number of bonus features are available in Io. The first one that you’re likely to encounter in the base game is the Charged Wild. This wild has four lives, and a life is used up when it is involved in a win. Then, instead of disappearing, it stays on the reels with its additional 3 lives. This will continue until the next spin or until all four lives are used up.

Then, there’s the Wild Forge. This feature will fill up a space beneath a wild and apply a multiplier to the symbol. Every time the wild is involved in a win, the multiplier will increase.

Finally, you’ll benefit from the Laser feature. When two laser beams intersect, all of the symbols in between them (and the two symbols that the lasers come from) will turn wild. If there is just one laser, it will remove all of the symbols in its path.

You can also trigger a free spins round by landing three bonus symbols. During this bonus, you play with the full 262,144 winning ways at all times. The charged wilds and wild forge symbols are collected at the bottom of the reels, to help you land some very big wins.

Overall Review

We really loved ELK Studios’ Cygnus, and it’s great that the developer has come out with another game that features this format. This is such an interesting mechanic that brings something totally unique to the online gaming market, and it really keeps you entertained as you spin the reels.

While Io has the same variance as Cygnus, we found that wins were a bit more sparse. So, we found it to be closer to a 9/10 in terms of volatility, as we didn’t seem to land many payouts but we were lucky enough to bag a 200x win during the base game.

Overall, Io is a great online slot that is certainly worth a spin if you’re a fan of this particular format. All of the base game features elevate the gameplay even further, so you’re in for a fun time while playing Io slots from ELK Studios.

* Io trademark / license is owned by ELK Studios. This site is not endorsed by ELK Studios.

Slot Data
Slot Name: Io
Software: ELK Studios
RTP: 96%
Volatility: High volatility
Paylines: 262144
Reels: 7
Min Bet (all lines covered): 0.2
Max Bet: 100
Top Win: 5000
Features: Wild Symbol , Scatter Symbol , Multiplier , Free Spins , Expanding Wilds , Sub Symbols In Feature , Clusters , High volatility , 7 Reels , Cascading , Expanding Reels , Turbo Spin

Io Slot FAQs

What is the RTP of Io?

Io from ELK Studios has an RTP of 96%.

What is the largest payout available on Io?

When playing Io, the biggest win you can land is worth 5000x your stake.

How volatile is Io?

According to ELK Studios, IO is an 8/10 on its volatility scale.

How do the base game modifiers work?

There are three modifiers that can randomly be triggered in Io. A single Charged Wild can be used in up to 4 wins in a spin, the Wild Forge has increasing multipliers attached to it while Lasers can turn symbols wild or destroy symbols.

Are there free spins in Io?

Landing three scatters will trigger the free spins bonus in Io.

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User Reviews
Overall score:2.8 out of 5 stars

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