Io Slot

ELK Studios - Io

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Io Online Slot Review

Io is a sci-fi-themed Io slot from ELK Studios online slots. Io features some unique gameplay elements. It plays out over 6 reels, with 4,096 ways to win. Tumbling symbols add more real money-winning ways and extra rows, so you can end up with a huge 262,144 different ways to line them up for a prize.

Other exciting features include Charged Wilds that stay active, multiplier wild symbols, and lasers that create even more wild symbols. During the free spins round, these wilds collect at the bottom of the game for even bigger wins. You can grab a prize equal to 5,000x the stake, or 500,000 credits at the maximum bet.

Take a virtual trip to one of Jupiter’s moons when you play the Io online slot on a PC or mobile device at our top-rated casinos. Learn about other online slots at and check out some no deposit bonuses as well.

Io Game Logo
RTP 96.00%
Volatility Medium
Maximum Win €500,000.00
Bonus Buy Icon Error No
Game Provider ELK Studios

Licensing Authorities and Testing Agencies

Io Online Slot Setup, Controls, & Paytable

The Io online slot plays out on a portrait-oriented screen, with the controls either to the sides or below, depending on whether you play on a PC or mobile. Those controls work in just the same way and give you a wide real money bet range running all the way from just 0.20 to 100 credits per spin. You play with 20 coins and just click on your chosen bet level to get started.

Other control buttons activate autoplay and fast spin modes, and the little “i” tab opens up the paytable. Here, you can see how much you win from each symbol when it crosses at least 3 of the 6 reels. Each symbol is in a circle, and they fit together in a zig-zag pattern, making the Io online slot from ELK Studios look unique.

Inexperienced players might be put off by this unusual layout, but it’s pretty easy to grasp. has a variety of online slot bonuses available to give you an extra boost, but you can also see our free play version of the Io online slot if you’re unsure about its gameplay.

Play Io Slot on Mobiles

The portrait style fits naturally on the screen of a smartphone, and the Io slot machine is a great game to play from your iOS or Android device. You won’t miss out on any features, options or rewards when you play on a mobile.

Reels 6
Rows 4
Autoplay Option
Autoplay Option Icon Yes
Release Date
Release Date 01/06/2020
Paylines 4096/262144
Minimum Bet
Minimum Bet €0.20
Maximum Bet
Maximum Bet €100.00

Io Online Slot Gameplay Features

The sci-fi theme runs through the Io slots game. The reels sit in the window of a spacecraft, against a backdrop of deep space, with a purple planet looming behind. Bright playing card symbols, stars, lucky clover, diamonds and red 7s fill the reels.

The red 7 that pays the most, returning 500x your coin value, so expect to see it across the reels less often than the lower value card symbols. Those are worth between 20 and 35 coins.

Charged Wilds, Free Drops & Other Io Bonus Features

Players arriving at this ELK Studios game from our online slots game providers will find that the Io online slot is packed with out-of-this-world features. All symbols in a win vanish from the game and others roll in from the adjacent reels as new symbols drop from above to fill the gaps. An extra row appears on top, boosting the number of ways to win from 4,096 to 15,625.

If that creates a new combination, the process repeats, with a further row added. This can go on until you have 8 rows of symbols, and 262,144 winning ways in this real money slot.

You also benefit from Charged Wild symbols that act as others to complete combinations; they stick around until they have helped to complete 4 combinations. Single lasers shoot across the reels, removing symbols and double lasers do the same, but leave wilds behind.

Three bonus symbols launch 7 free drops, which play out on the full 8 rows of symbols at no cost. During this feature, wilds collect at the bottom of the round, helping to complete lots of combinations.

Slot Features

Multipliers Icon Yes
Scatters Icon Yes
Wild Symbol Icon Yes
Free Spins Icon Yes
Expanding Reels Icon Yes
Sticky wilds Icon Yes
Random wilds Icon Yes
Multiplier wilds Icon Yes
Cascading Reels Icon Yes
Retriggering Icon Yes

Io Online Slot Max Payouts, RTP & Volatility

You can win 5,000x your real money total bet during the free games round, which equals prizes up to 500,000 credits if you have the maximum stake of 100.00 on the triggering spin. This is a medium to high variance game, where payouts come in at an average of 96% -- players who enjoy the best slot sites will know that this is right about average for RTP.

Our Io Rating & A Similar Online Slot

We loved playing this game. It’s very different from others, with symbols rolling onto adjacent reels and extra rows added on any win. The medium to high variance means you won’t get a win on every spin, but prizes can be quite high in value to compensate.

If the Io online slot is a little too “alien” for you, try the more conventional 5-reel, 25-line Star Scape online slot from Microgaming. Check out our range of top-quality online and mobile casinos here on to see where you can play these space-themed games.

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Meet Our Slot Tester

Karolis Matulis
Karolis Matulis Slot Tester

Karolis Matulis is an SEO Content Editor at with more than 5 years of experience in the online gambling industry. Karolis has written and edited dozens of slot and casino reviews and has played and tested thousands of online slot games. So if there's a new slot title coming out soon, you better know it – Karolis has already tried it.

This review is based on the writer's personal opinion is an informative comparison site that helps users find the best products and offers. We maintain a free service by receiving advertising fees from the brands we review. Ratings are based on position in the comparison table or specific formulas. We strive to keep information up-to-date, but offers are subject to change. We do not compare or include all brands and offers.

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