Shamrock Holmes Megaways Slot Review

Powered by Microgaming and All41Studios, the Shamrock Holmes Megaways slot is an Irish/detective themed game that uses Big Time Gaming’s famous mechanic. With 6 reels and up to 117,649 ways to win, it comes with Rolling Reels for continuous wins. There’s a re-spin feature where you can get a free re-spin with up to 117,649 guaranteed Megaways. In the Free Spins feature, you begin with a 2x multiplier as wins increase the multiplier infinitely. With an RTP of 96.44%, the max win is 28,000 x your total stake per spin.

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Shamrock Holmes Megaways Slot RTP, Details & Wager Limits

The Shamrock Holmes Megaways slot has 6 reels and uses Big Time Gaming’s Megaways mechanic. With between 2 and 7 symbols appearing randomly on each reel, you can play with up to 117,649 ways to win (or Megaways).

The more symbols per reel, the more possible winning combinations. For more details on how the mechanic work, check out our Megaways online slots section. A winning formation is formed by landing 3 to 6 matching symbols on successive reels starting from reel 1. The only exception is Shamrock Holmes himself as you only need 2 on adjacent reels.

When it comes to stake levels, you can spin away from 20p to £20 per spin. Just click on the coins icon on the right hand side of the game to adjust your bet level. There’s an Autoplay function where up to 100 autospins can be chosen. You can play with or without the sound effects and using a Quick Spin mode for faster spin speed.

The Shamrock Holmes Megaways RTP is 96.44% which is over the 96% slot average. This means you will win back £96.44 on average for every £100 you play or wager. Highly volatile, you won’t have to wait long for a winning combination as it comes with a 35.34% hit frequency. This means over a third of spins will result in a winner. When it comes to payouts, the max win is 28,000 x your total stake per spin.

Theme – Audio and Design Features – join the Irish detective

Shamrock Holmes Megaways slot base game

The Shamrock Holmes Megaways slot has an Irish luck theme. Set in an enchanted forest, it’s all about the Shamrock Holmes character which combines a lucky leprechaun with the infamous Sherlock Holmes. The soundtrack is calming and peaceful until you press the spin button. The traditional Irish jig gathers pace as you play.

With the symbols appearing on wooden slats, they include Gaelic style A, K, Q, J, 10 and 9 royals. The higher value symbols include Spring Gentian flowers, Shamrock flowers, pixies with cauldrons full of gold coins and Shamrock Holmes. The Shamrock Holmes character is the most rewarding symbol giving you 1, 2, 10, 25 or 50 x your total stake for 2, 3, 4, 5 or 6 in combination.

There is also a W wild symbol which can only appear on the extra reel (above the main reel area). As you can expect, it substitutes for all symbols except scatters and symbols participating in a re-spin trigger.

As with all Microgaming slots these days, Shamrock Holmes Megaways can be played on desktop, mobile and tablet devices as standard. The high definition graphics and animations work well on smartphone screens too.

Bonus Features in Shamrock Holmes Megaways

The Shamrock Holmes Megaways comes with 3 bonus features in total. You have Rolling Reels for continuous wins, free re-spins with a certain number of guaranteed Megaways and free spins with an unlimited, increasing win multiplier.

Rolling Reels feature

When you get any winning combination, the Rolling Reels feature will be activated. Winning symbols are cleared from the reels and replaced with new symbols. This continues until no more new wins are formed. It can lead to multiple consecutive wins per spin.

Magic Forest Re-Spin feature


There’s a Magic Forest Re-Spin feature which can be triggered in 3 different ways. For all variants, you need 3 gold shamrock coin scatters on the main reels. Then you ned to pixie, leprechaun or pixies plus leprechaun.

Only applying in the base game, this will give you a free re-spin with a certain number of guaranteed Megaways:

Trigger Condition Reward
3 scatters + leprechaun + pixie on extra reel Re-spin with 117,649 guaranteed Megaways
3 scatters + leprechaun on extra reel Re-spin with 32,400 guaranteed Megaways
3 scatters + pixie on extra reel Re-spin with 10,000 guaranteed Megaways

Free Spins feature


Look out for the gold shamrock coins as this is the scatter. 4 of them appearing anywhere on the reels will trigger the Free Spins feature with 10 free spins awarded. Each extra scatter adds 2 more free spins to that tally (i.e. activate with 6 scatters to get 14 free spins).

Beginning with a 2x multiplier, all wins are doubled. Each Rolling Reel trigger increases the multiplier by 1. Like the Unlimited Win Multiplier feature found in many Megaways slots, each win effectively increases the multiplier, with no limits.

Finally, 3 scatters appearing on the extra reel will give you 3 more free spins. 4 scatters will give you 4 more free spins. There’s no limit to how many free spins you can play with.

Shamrock Holmes Megaways Review Summary – entertaining Megaways slot

The Shamrock Holmes Megaways slot is the first Megaways venture between All41Studios and Microgaming. They’ve chosen a popular theme and used popular bonus features to constitute the gameplay. There’s nothing innovative or unique about the gameplay but it does come together rather nice.

Whilst we’ve seen Rolling Reels (Cascading Wins/Reactions), re-spins and free spins with increasing multipliers many times before, the upbeat soundtrack and theme will melt the hearts of most Megaways aficionados. The key to big wins is to build up the multiplier in the Free Spins feature, which has no limits.

Microgaming has done a good job with Shamrock Holmes Megaways and I’m sure they will add other features found in popular Microgaming slot to future releases. As far as Megaways slots go, there are better games out there such as Bonanza Megaways and/or Gonzo’s Quest Megaways.

Shamrock Holmes Megaways FAQs

What is the Shamrock Holmes Megaways RTP?

The Shamrock Holmes Megaways return to player rate is 96.44%. Higher than most online slot games, the variance is sky high but has a hit frequency rate of 35.34%.

What is the Shamrock Holmes Megaways max win?

The most you can win in this Irish luck themed game is 28,000 x your total stake per spin. The key to big wins is from the unlimited multiplier in the free spins.

Is there a Shamrock Holmes Megaways free spins feature?

Yes, the Free Spins feature begins with a 2x multiplier. Each Rolling Reel win increases the multiplier by 1 with no limits. You can also win additional free spins – again with no limits.

How does the Magic Forest Re-Spin feature work?

The Magic Forest Re-Spin feature can be activated in 3 ways. You will then get a free re-spin with 10,000, 32,400 or 117,649 guaranteed Megaways.

Shamrock Holmes Megaways Slot Information

  • Game:
    Shamrock Holmes Megaways
  • Provider:
  • Type:
    Megaways Slot
  • Reels:
  • Paylines:
    Up to 117,649
  • Stakes Range:
    20p to £20
  • Bonus Features:
    Yes (3)
  • Free Spins/Multiplier:
  • RTP %:
  • Max Win:
    28,000 x
Review by Chris Taylor

Review by Chris Taylor

Chris is a slots expert that has reviewed and played over 4,000 online slots. Having being in the iGaming industry for over 16 years, he knows how slots work, how bonus features are triggered and how the RTP and variance affect the gameplay.