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Elk Studios
RTP 96%
Play Elk Studios Slots
Reels 6
Paylines 4096
Min bet size 0.20
Max bet size 100
RTP 96.5
Wild symbols Yes
Free spins Yes
Bonus No
Jackpot NA

IO Slot Review

Released June 2020

The IO slot can be found at casinos offering Elk Studios software. Elk Studios are a small but well-established casino software developer primarily focusing on the mobile market. At the present time they only offer slots games. Players should be aware that this software provider includes ‘betting strategies’ as an automated feature. These should be avoided. They offer no mathematical gain to the player and increase the risk of large losses in comparison to your bankroll. As a standard Elk Studios do publish the RTP/House Edge information for their slots games within their game paytable. As such we can say that the House Edge of IO is 4%.

IO is a 6 reel slot and each reel sits a 4 symbols high. Instead of paylines you form wins when you land 3 or more matching symbols across adjacent reels, playing from left to right. In the base game with the standard number of rows there are 4096 different ways to win. However, this can rise to 262,144 if the number of rows reaches the maximum level of 8 symbols high.


IO is a science fiction themed slot. The colours are neon, predominantly pinks and purples. A giant purple planet, something similar to Jupitar can be seen beyond the reels, giving the impression that you are sat on a space ship or station.

Avalanche – Every time you form a winning combination the symbols involved will disappear from the reels, with new ones dropping down into place and with an additional row appearing above the existing ones. As this happens you will increase the number of ways to win. The rows can reach the maximum height of 8 rows.

Special Symbols

Wild – The Wild symbol is a “W”, which will substitute for any regular symbol.

Charged Wild – The Charged Wild acts a regular Wild except it comes with 4 lives. You lose a life when it helps to form a win and sill remain on the reels as a regular Wild on the spin following the loss of its 4th life. Charged Wilds will remain on the reels throughout this process.

Bonus– The “Planet” is the Bonus symbol. You need 3 or more of them anywhere on the reels to trigger the Free Drops feature.

Wild Forge – The Wild Forge symbol will fill a space below with a multiplier. The multiplier will increase with each drop.

Laser – Laster symbols will fire a laser into the symbols in a straight line in whatever direction they are facing. Those symbols will then disappear from the slot, creating a mini avalanche. If 2 Laser beams intersect, regular symbols along the beams up to the intersection point will become Wilds.

Bonus Features

Free Drops – If you trigger the Free Drops feature you are given 7 Free Spins and the symbols will come stacked 8 symbols high. The feature can be retriggered.


This is a quality looking slot that comes with a number of exciting features. However, the betting strategies that Elk continue to include remain a major issue. They offer no advantage and could in fact be considered a dangerous inclusion in a game that is based entirely on random chance. The implication that skill or a tactic can be in any way deployed is one that we cannot endorse, no matter how good this slot might be. With a fair degree of regret we cannot give IO a positive review.

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