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Hottest Online Slots Releases to Try in 2021

S. Stoynova
Svetlana is a seasoned iGaming writer who has been contributing to CasinoGamesPro.com since 2015. She specialises in in-depth reviews of casino games, including slots, roulette, blackjack, and video poker. Her expertise also extends to evaluating payment methods, mobile casino apps, and leading online gambling platforms.
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Slot machines are among the most popular casino games to ever exist. Every casino, be it land-based or online, offers an abundance of slots. Nowadays, the iGaming industry is oversaturated with online casinos and software companies that go above and beyond to attract the attention of players. Game makers are trying to include new elements in the games they release to keep casino fans engaged.

It seems that, this year, software companies are focusing primarily on slots that run on the popular Megaways engine. In October 2020, the industry giant Microgaming penned a deal with Big Time Gaming for its Megaways mechanic, and the first Megaways-based slot developed by Microgaming is already on the market. In the lines below, we will discuss some of the latest slot releases that have taken the online gambling world by storm.

Power of Thor Megaways

Thor is wielding his mighty hammer in the slot game Power of Thor to make the bravest warriors rich. As the name suggests, the slot is inspired by Norse mythology, more precisely the ancient Norse god Thor. Its cartoonish style gives the game a distinct character. Released in April 2021, the slot once again demonstrates Pragmatic Play’s creativity.

Power of Thor Megaways
Screenshot of Power of Thor Megaways

The game runs on the Megaways engine, expanding players’ ways to win to 117,649. Some of the game’s other exciting features include tumbling reels, stacked wilds, free spins, and a constantly increasing win multiplier.

Slot fans have to match at least 3 identical symbols on a payline to win a cash prize. Only the symbol depicting Thor pays for two-of-a-kind. In fact, it is the highest-paying symbol, followed by the Blue Viking, the Green Viking, and Freya. Power of Thor Megaways offers a maximum winning potential of 5,000x the stake.

The game is played on 6 reels that can transform during the gameplay. Perhaps the most interesting part of the game is the random double wild reel feature. The real action takes place during the free spins round. Players can trigger up to 30 free spins with an unlimited win multiplier that increases by 1 after every win. To unlock the free spins round, slot fans have to land 4 scatter symbols spelling the name of the god THOR.

You can also purchase your entry into the free spins round. The bonus-buy feature is not available to players residing in the UK due to regulations. Once you manage to enter the bonus round, you will receive 10 free spins. Assuming that Lady Luck smiles on you and 4 more scatter symbols land on the reels, you will get 4 extra spins.

Provided that you trigger between 10 and 22 free spins, you will unlock the gamble feature, which allows you to spin a wheel in an attempt to secure additional free spins. Here is the catch—if you lose, you forfeit all of your free spins.

Power of Thor Megaways Slot Summary
ProviderPragmatic Play
Release dateApril 2021
PaylinesUp to 117,649 ways to win
RTP96.7%
ThemeNorse mythology
Min/Max betFrom $0.20 to $100
Bonus FeaturesFree spins, bonus buy feature, progressive win multiplier, gamble feature, cascading reels
Maximum winning potential5,000x the stake

Shamrock Holmes Megaways

Shamrock Holmes is the first Megaways-based slot released by Microgaming in partnership with All41 Studios. The action takes place on 6 reels, with 2 to 7 symbols landing on each. This produces up to 117,649 ways to win. The game features medium-to-high volatility and comes with an average RTP of 96.44%.

Shamrock Holmes Megaways
Screenshot of Shamrock Holmes Megaways

Judging from the title, it is not hard to guess that the game is based on the classic Irish luck theme. Once you load it, you will find yourself in the middle of a magical forest. The grid and symbols are designed to nicely complement the overall theme.

The W icon is the wild symbol, performing its usual substitution duties, and can appear only on the extra reel located above the main reels. The game comes with 3 special features to optimize players’ winning potential. The first is the Rolling Reels feature, which triggers after a winning spin and clears all winning symbols to make space for new ones.

The second feature is the Magic Forest Respins, activated when players hit the right combo on the extra reel. The feature guarantees between 10,000 and 117,649 ways to win, depending on the symbols that land on the extra reels.

Players need to land 4 scatter symbols on the grid to activate the free spins bonus round. Initially, they will receive 10 free spins. For each additional triggering scatter, players get 2 extra free spins. The free spins are accompanied by an ever-increasing multiplier that starts at 2x. The multiplier rises by 1 every time a winning combo lands on the reels, and it does not reset after a losing combination.

Shamrock Holmes Megaways Slot Summary
ProviderMicrogaming
Release dateJanuary 2021
PaylinesUp to 117,649 ways to win
RTP96.44%
ThemeLucky leprechaun
Min/Max betFrom $0.20 to $20 per spin
Bonus FeaturesFree spins, cascading reels, unlimited win multipliers, respins with guaranteed Megaways
Maximum winning potential28,000x the stake

Madame Destiny Megaways

Pragmatic Play’s slot game Madame Destiny Megaways was introduced to the online gambling circuit in January 2021. The highly volatile game is based on the company’s previous slot, Madame Destiny. If you are ready to embark on a mystical gambling adventure, then Madame Destiny Megaways is the right game for you.

Madame Destiny Megaways
Screenshot of Madame Destiny Megaways

A foggy woodland serves as the background. The grid features 6 reels and up to 200,704 ways to win. Visually, Madame Destiny Megaways is a true sight to behold. Every single detail is well thought out to fit the theme of the slot. The top prize here is 5,000x the wager. The symbols are valued differently, but the icons that offer the highest payouts are the owl, the black cat, the heart-shaped potion bottle, the candles, and the tarot cards.

To ramp up the fun, the software developer included some adrenaline-fueled features. The tumble feature triggers after a winning combo, clearing all winning symbols, which are then replaced by new ones. The feature remains active as long as new winning symbols land on the reels.

The slot also offers a free spins bonus feature that can be unlocked by landing between 3 and 6 scatter symbols depicting a crystal ball. The scatter not only triggers the bonus but also pays up to 100x the stake for 6-of-a-kind. Once you unlock the bonus round, you will spin a bonus wheel that determines the number of free spins and the value of the multipliers, which can reach up to 50x.

Players can also buy the feature for 100x their stake, provided they are not from the UK. If you do not wish to purchase the feature, you can improve your chances of triggering it by enabling the Ante Bet option, which raises your stake by 25%.

Madame Destiny Megaways Slot Summary
ProviderPragmatic Play
Release dateJanuary 2021
PaylinesUp to 200,704 ways to win
RTP96.56%
ThemeFortune Teller
Min/Max betFrom $0.20 to $100 per spin
Bonus FeaturesFree spins, bonus wheel, multipliers, cascading reels, Ante bet
Maximum winning potential5,000x the bet

Rome: The Golden Age

With the launch of the slot Rome: The Golden Age in February 2021, NetEnt once again consolidated its presence in the iGaming market. The game features a strong Ancient Roman theme enhanced by the Colosseum in the background. The designers also included the image of a golden laurel wreath, a symbol of triumph.

Rome: The Golden Age
Screenshot of Rome: The Golden Age

Although Rome: The Golden Age is a highly volatile slot, it offers payouts that can reach up to 100,000x the stake. The slot features 20 fixed paylines and 5 reels, each hosting a different number of symbols. Players can win by lining up 3 to 5 symbols on a payline.

The symbols are beautifully designed. Lower-paying symbols are the card royals from 10 to Ace. Higher-payout icons include the tiger, the Roman helmet, the gold ring, and the Aquila. The slot also features special symbols—a wild and a scatter. The wild replaces all other symbols except the scatter and pays up to 5x the stake.

The big wins are hidden in the bonus features. If a Golden Age symbol lands during the base game, a point is added to the progress bar. Every time players collect 200 points, the free spins multiplier increases. The multiplier can reach up to 1,000x and applies only during the free spins round.

Three scatters appearing on reels 2, 3, and 4 trigger the free spins round. Players who unlock the bonus receive 3 free spins that can be reset. The round ends when no free spins remain or when all positions on the grid are locked.

Rome: The Golden Age Slot Summary
ProviderNetEnt
Release dateJanuary 2021
Paylines20 paylines
RTP96.06%
ThemeAncient Rome
Min/Max betFrom $0.10 to $50
Bonus FeaturesFree spins, transforming wilds, increasing multipliers
Maximum winning potential100,000x the bet

Gordon Ramsay: Hell’s Kitchen

NetEnt created a branded slot for all fans of the famous restaurateur Gordon Ramsay and his TV show Hell’s Kitchen. The game features a 5×3 grid and 20 paylines, offering a respectable maximum winning potential of 1,000x the stake. The slot boasts crystal-clear graphics, and the gameplay is straightforward. The symbols can whet the appetite of players who love delicious food, with the highest-paying icons depicting Gordon Ramsay’s signature dishes.

Gordon Ramsay: Hells Kitchen
Screenshot of Gordon Ramsay: Hell’s Kitchen

The master chef is known for throwing objects at chefs who are negligent in their job. In the game, Ramsay once again hurls objects—this time at the reels—turning symbols into wilds. Players can receive 5 to 7 wild symbols. The wild substitutes for all other symbols except the scatter.

The most exciting part of the game is the Team Challenge free spins feature, activated when 3 or 4 scatter symbols land on the reels. Once unlocked, you will see two play areas—one for the blue team and one for the red team—and you must choose which team to join. During the round, you may receive up to 3 Order Up features that come with a win multiplier.

After the free spins feature ends, the winning team is declared. Players who joined the victorious team, or when both teams finish with the same result, will enter Gordon’s Bonus Game. It consists of 15 menus hiding three types of prizes, and the bonus game ends when players reveal all three “X” symbols.

Gordon Ramsay: Hell’s Kitchen Slot Summary
ProviderNetEnt
Release dateMarch 2021
Paylines20 paylines
RTP96.07%
ThemeTV show, cooking competition
Min/Max betFrom $0.20 to $400
Bonus FeaturesFree spins, multipliers, a bonus game
Maximum winning potential1,000x the stake

The Faces of Freya

Play’n GO is a reputable software provider that recently added yet another title to its extensive portfolio—The Faces of Freya. In Norse mythology, Freya is the goddess of love and war. Her beauty inspired the game makers at Play’n GO to create a slot game in which she is the main character. The medium-volatility slot offers a top cash prize of up to 5,000x the stake. The action takes place on 5 reels, and the grid is set against a beautiful landscape depicting a river and hills.

The Faces of Freya
Screenshot of The Faces of Freya
The premium symbols are the bracelet, the cats, the boar, and the axe. The Freya icon is the wild symbol and replaces all others except the scatter. The wild can land on all 5 reels and pays 40x the stake for 5 identical symbols.

The medallion is the scatter symbol. If you land 3 scatters on the reels in a single spin, the free spins bonus feature activates and awards 6 free spins. It is important to note that the game offers three types of free spins, each featuring different modifiers such as symbol upgrades, extra wilds, and multipliers.

Provided that today is your lucky day and 4 or 5 scatters appear, you will get 18 or 19 free spins. Additionally, you will benefit from all modifiers associated with the different free-spin types in succession. The last 3 or 4 free spins are played with all three modifiers applied simultaneously.

The Faces of Freya Slot Summary
ProviderPlay’n GO
Release dateFebruary 2021
Paylines20 paylines
RTP96.20%
ThemeNorse mythology
Min/Max betFrom $0.20 to $100
Bonus FeaturesFree spins, additional free spins, progressive multipliers, extra wilds, transforming symbols
Maximum winning potential5,000x the stake

Crown of Valor

Earlier this year, Quickspin announced the release of its cluster-pays slot Crown of Valor. Once you load it, the game transports you back to the Dark Ages during a castle siege. To heighten the atmosphere, the game is accompanied by a soundtrack reminiscent of war. The overall feel is rather intense as winning symbols fall from the grid, making space for new ones. We have to admit that this title shows how talented Quickspin’s game designers are.

Crown of Valor
Screenshot of Crown of Valor

The highest-paying symbol is the crown. Players must build a cluster of at least 5 identical symbols to win. The top prizes for each symbol are reserved for players who manage to create a cluster of 12 or more. Winning clusters activate the Burning Wilds feature.

The Burning Wild symbol replaces all others except the scatter. If a Burning Wild is part of a winning cluster, it increases the multiplier meter by 1. Create another winning cluster, and an additional Burning Wild is added to the grid, boosting the chance of a tumble win.

Players need at least 3 scatter symbols to activate the free spins feature. Depending on the number of scatters, they will get 10, 14, or 18 free spins. Winning tumbles during the round increase the multiplier by 1, and the multiplier does not reset.

If a scatter appears during free spins, players receive an extra spin. The game also allows players to buy the feature, although this option is unavailable in certain jurisdictions.

Crown of Valor Slot Summary
ProviderQuickspin
Release dateMarch 2021
PaylinesCluster Pays
RTP96.16%
ThemeEarly Middle Ages
Min/Max betFrom $0.20 to $100
Bonus FeaturesFree spins, cascading reels, extra wilds, buy feature, progressive multipliers
Maximum winning potential15,619x the bet

War of Gods

If you are into Greek mythology, you will certainly be interested in Red Tiger’s slot War of Gods. This high-variance slot is played on a 5×4 grid with the potential to expand to 7×6. The color scheme is rather dark, and in the background players will see an apocalyptic landscape. The highest-paying symbols depict various gods, while the lower-paying ones are card suits.

War of Gods
Screenshot of War of Gods

Players must match at least 3 identical symbols on a payline to win. Naturally, the more matches you spin, the bigger your prize will be. Upon triggering a bonus feature, players can benefit from multiple respins and symbol upgrades. The main drawback is the absence of win multipliers and free spins.

War of Gods Slot Summary
ProviderRed Tiger
Release dateJanuary 2021
PaylinesUp to 60
RTPApproximately 95.66%
ThemeGreek mythology
Min/Max betFrom $0.10 to $20
Bonus FeaturesRespins, stacked symbols, expanding reels, expanding wilds, symbol upgrades
Maximum winning potential2,518x the bet

Templar Tumble

Templar Tumble is a highly volatile slot courtesy of the prestigious software company Relax Gaming. The game is hot off the press, but it has already won the hearts of many players who enjoy medieval-themed slots. The design is not cluttered with elements—its beauty lies in simplicity. The two sides of the grid are adorned by statues of a knight and a griffin, and an epic soundtrack enhances player immersion.

Templar Tumble
Screenshot of Templar Tumble

Although the game offers up to 117,649 ways to win, it does not utilize the Megaways mechanic. The symbol that pays the most is the knight’s helmet. Other icons include heraldic emblems, the tree of life, the Templars’ red cross, and more.

Templar Tumble features tumbling reels, meaning that winning symbols are removed from the grid to make space for new ones. Tumbles also remove blockers, allowing extra symbols to appear. Central to this slot is the Mystery Reveal feature, triggered whenever a wild lands on reels 2 to 6. When activated, 3 to 8 blocker symbols transform into mystery symbols and remain on the grid as long as consecutive tumbles occur.

Players who clear all blockers on the grid receive 6 free spins. The grid then expands to 6×7, providing 117,649 ways to win. It is crucial to note that there are no blockers during free spins. If wild symbols land during the round, 3 to 6 symbols morph into mystery symbols.

Templar Tumble Slot Summary
ProviderRelax Gaming
Release dateMarch 2021
PaylinesUp to 117,649 ways to win
RTP96.26%
ThemeMedieval
Min/Max betFrom $0.10 to $50
Bonus FeaturesFree spins, cascading reels, mystery symbol
Maximum winning potential17,289x the bet

Miner Donkey Trouble

Play’n GO’s trademark is the slick visuals of its games, and the developer certainly does a lot to keep players on the edge of their seats. Aside from The Faces of Freya, the company launched yet another mind-blowing title earlier this year—Miner Donkey Trouble. Even though mining is a serious job, the game makers took a light-hearted approach. On the left side of the grid stands an annoyed-looking donkey, while an old miner holding a pickaxe appears on the right.

Miner Donkey Trouble
Screenshot of Miner Donkey Trouble
The symbols will not surprise slot fans familiar with mining-themed slots. Various gems and rocks dominate the reels, each offering different payouts. A winning cluster consists of at least 5 matching symbols connected horizontally and/or vertically. The game employs cascading reels, so winning symbols disappear and new ones fall into place.

The game features a wild symbol that substitutes for all symbols except the scatter. Next to the donkey you will see a Donkey Destruction meter. Depending on the number of winning symbols, one of three tiers of the Donkey Destruction feature is triggered, each coming with unique perks. Golden Nugget symbols do not pay directly, but they increase the win multiplier by 1. In the base game, the multiplier resets to 1x at the start of a new paid spin.

The dynamite symbol acts as a scatter. If 3 scatters land, players receive 5 free spins. During free spins, the win multiplier does not reset, even after a non-winning combo. It is also possible to win up to 20 additional free spins if more scatters appear during the bonus.

Miner Donkey Trouble Slot Summary
ProviderPlay’n GO
Release dateJanuary 2021
PaylinesCluster Pays
RTP96.27%
ThemeMining
Min/Max betFrom $0.10 to $50
Bonus FeaturesFree spins, cascading reels, multipliers, additional wilds, symbol swap, mega symbols
Maximum winning potential10,000x the stake

Book of Tombs

Booming Games is a relatively new software company that has already made a name for itself. Its latest slot, Book of Tombs, is among the hottest releases of the year. Even though there are hundreds of Egyptian-themed slots, Book of Tombs stands out thanks to its quality graphics and rewarding payouts. The slot offers a standard 5×3 grid and 10 fixed paylines.

Book of Tombs
Screenshot of Book of Tombs

To add extra flavor to the gameplay, the slot features a free spins round. To trigger it, players must hope that at least 3 wild scatters land on the reels. Initially, slot fans receive 8 free spins, and a random symbol is chosen to act as the expanding symbol. The wild scatter itself cannot be selected as an expanding symbol.

If 3 or more wild scatters appear during the free spins round, players receive 8 additional free spins. There is no cap on the number of free spins. Each time extra spins are triggered, an additional expanding symbol is randomly selected.

Upon hitting a winning combo in the base game, slot enthusiasts have the chance to double or quadruple their winnings via the gamble option.

Book of Tombs Slot Summary
ProviderBooming Games
Release dateJanuary 2021
Paylines10
RTP95.42%
ThemeAncient Egypt
Min/Max betFrom $0.10 to $75
Bonus FeaturesFree spins, expanding symbols, gamble feature
Maximum winning potential5,504x the bet
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