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IO (ELK Studios)

IO is a 5-reel, 4096 paylines slot from ELK Studios. You can play the free demo version here—no download needed, giving you a risk-free way to explore all bonus mechanics and gameplay elements. When you're ready to play for real money, scroll down to find our top-rated, trusted online casinos featuring IO—all carefully selected for safety and quality.

IO Free Slot Demo

Responsible Gaming

To access demo slot please confirm that you are at least 18 years old

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Facts & Features

RTP ? : 96.1%

Max Win: 5000x

Slot Rating: 7 / 10 👍 Good

Expanding Reels, Extra Wilds, Megaways, Random Wilds, Wilds,

Slot Themes

Space, Sci Fi,

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IO Review

IO by ELK Studios is an online slot which is playable on most devices, including mobiles and pads. This game has some interesting themes and exciting features to know about. Find out more from our IO slot review below. Further down this page you can also find more popular slots from ELK Studios.

Pros and Cons

Positive

Sci-Fi Themed
Player Favourite
Decent Max Win at 5000x
Megaways

Negative

No Progressive Jackpot

Themes and Gameplay

IO is designed with themes like Space, Sci Fi, in mind. The layout of this game is pretty standard and consists of 5 reels with 4096 possible paylines. In most jurisdictions you can also select the Autoplay option when playing IO. You can choose from 10, 25, 50, 100 or even more spins. You can opt to stop Autoplay on a win, if a single win exceeds a certain amount, or if your balance increases or decreases by a chosen amount. This is a great way to stay in control and to play more responsibly.

Maximum Win, RTP and Volatility

Here you have the potential to win 5000 times your total bet. This can give you very big wins if you manage to hit some high paying symbols. This value is calculated on a very large number of spins, often a billion spins.

The standard RTP for IO is 96.1% (Can be lower on some sites). This is quite low and considered to be below average for an online slot. RTP stands for Return to Player and is the percentage of stakes the game returns to the players. For example, if a player bets €10 the expected return for this game would then be €9.61. However, the RTP value is calculated over millions of spins which means the outcome of every spin will be totally random.

Game Features

Who doesn't like plenty of action and great features in a slot! Some of the most popular features available in IO is Expanding Reels, Extra Wilds, Megaways, Random Wilds, Wilds, It also has a bonus game, the most liked free spins bonus rounds and if you are lucky this is usually where you can win the big bucks.

Reviewed 6/2/2020 by CasinoSlotsGuru.com

Slot Rating: 7 / 10 👍 Good

❓ IO – Frequently Asked Questions

🎮 Can I play IO for free?

Yes! You can try the IO demo slot directly on CasinoSlotsGuru.com without registration. It’s a great way to explore the game’s features, visuals, and volatility before betting real money.

💰 How do I play IO for real money?

To play for real money:

Choose a licensed ELK Studios casino from our recommended list.
Create an account and make your first deposit.
Claim your welcome bonus (if available).
Search for “IO” in the slot section.
Set your bet and hit spin button!

🎁 Are there bonuses for IO?

Yes! Many of our featured casinos on this page offer welcome bonuses, including free spins and deposit matches, that can be used on this slot. Always check the bonus terms for eligibility and wagering requirements.

🔥 What is the maximum win in IO?

The slot offers a max win of 5000x your total bet.

Example: A €1 bet could return moderate wins up to €5000 if you hit the top payout.

📊 What is the RTP of IO?

RTP (Return to Player): 96.1% – around average for online slots.

🧪 Is the demo version the same as the real game?

Yes. The demo version mirrors the full game in terms of features, mechanics, and visuals. The only difference is that you can’t win real money.

🧠 How do I win at IO?

Winning depends on luck, but understanding the game’s mechanics helps:

Learn how Paylines work.
Use Autoplay responsibly with stop conditions.
Trigger the free spins bonus round for the best chance at big wins.

📱 Is IO available on mobile?

Absolutely. The game is fully optimized for mobile play on both iOS and Android devices. You’ll enjoy smooth gameplay and stunning visuals on any screen size.