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Last Updated: November 20, 2023

Written by Stephen Cummings

May has arrived and so has a brand new collection of newly released online slot games. Over 100 new slots have been released in May and we have tested them all in order to showcase to you the top 20 slots released in May 2021.

As always, you can play all of the slot games below as well as many more by signing up to one of the online casinos on our list of the best slot sites in the UK. But without further ado, here are our picks of the top slot releases this month.


Mystic JokerVibraGamingMay 4 2021
Wheel of Fortune Ruby RichesIGTMay 5 2021
Flaming BarsPlaytechMay 9 2021
Wilds & PiratesZeus PlayMay 9 2021
Spirit of MustangPairplayMay 10 2021
Kronos MegawaysWMSMay 11 2021
Undying RomanceArcademMay 13 2021
Crypto GoldPG SoftMay 14 2021
Might of ZeusPlatipusMay 17 2021
Cold GoldSpearHeadMay 18 2021
Aztec Pyramid MegawaysBooongoMay 19 2021
Scroll of DeadPlaynGoMay 20 2021
Savage SharkLeanderMay 20 2021
Road to Riches MegawaysBarcrestMay 23 2021
Game of Thrones Power StacksMicrogamingMay 25 2021
Fishing in ThailandPlayStarMay 25 2021
Blue FortuneQuickSpinMay 25 2021
Roll to LuckEvoPlayMay 25 2021
Secret of TroyScientific GamesMay 26 2021
Age of the Gods: Norse LegendsPlaytech OriginsMay 30 2021


May brings with it yet another pleasant mixture of different slot games. In truth, there are no standout slots this month but there are several we would still like to tell you about.

As usual, May will see the release of several more Megaways slots games which continue to take the casino world by storm. Kronos Megaways from WMS, Aztec Pyramid Megaways from Booongo and Road to Riches Megaways from Barcrest will be released this month. The Megaways slot from Booongo we are in particular looking forward to playing as it is set to be the first Megaways release from the developers.

We are always on the lookout for newly released high rtp slot games here at SlotsHawk and May offered us a few slots with high rtp levels. Might of Zeus from Platipus and Cold Gold from Spearhead both offer extremely competitive return to player percentages. Although, neither can rival Goblins Cave from Playtech with its RTP of 99.32%.

We are also excited to play this months collection of low variance slot games too which are becoming increasingly rare as slot developers continue to produce high octane slots which can produce huge wins as opposed to lots of small wins which low volatility slots provide.

Jackpot slots players will be happy this month as Age of the Gods: Norse Legends is set to be released. Norse Legends is yet another addition to the fantastic Age of the Gods collection of progressive jackpot slots from Playtech Origins.

In last months slot releases, I picked out Gonzo’s Treasure Hunt as my pick of the top casino game and it truly does not disappoint. Find a new casino to play Gonzo’s Quest Treasure Hunt by visiting our list of new slot sites in the UK.


Created by the team at WMS, Kronos Megaways offers players big prizes as well as 117,649 ways to win on every spin. The RTP is 96,24% which is not too bad but its the fantastic number of features that excites me. Cascading reels, free spins, wild’s and a fantastic bonus round will entice many slots players.


Stephen Cummings

Greetings, I’m Stephen Cummings

Stephen Cummings is often referred to as ‘The Oracle’. What he doesn’t know about slot games isn’t worth knowing. He’s our genius slot machine analyst who spends most of his time reviewing new games & sites.

Slots analyst since 2020