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Boom Pirates Slot Review

Ahoy matey! Welcome to Boom Pirates, an awesome and innovative game from Microgaming that has redefined what’s possible with online slots! Released just a few weeks ago in October 2019, the game’s expanding reels, purchasable free spins, and unique FoxifyTM features all set the game apart from the typical stock.

Microgaming erupted onto the online slots development scene in 2014 and is still going from strength to strength: Boom Pirates is the latest in a string of innovative and incredibly enjoyable games!

How to play the Boom Pirates Online Slot Game

There is a fair amount going on in Boom Pirates – especially when the reels start expanding and moving around – but the essential gameplay is pretty straightforward:

  • Use the +/- buttons either side of the “Bet” reading to vary your wager from $0.20 to $50 per spin.
  • There’s an autoplay feature which allows players to control:
    • How many automatic spins should be completed
    • A single-win limit (after which the spins should stop)
    • An overall loss limit (after which the spins should stop)
  • The orange spin button will start the reels spinning.
  • Just left of the spin button there’s the “fast play” button: click this to accelerate the spinning so you don’t have to hang around so much!
  • Click the gift in the bottom-left corner in order to purchase 10 free spins for the cost of 50x the current wager.
  • Finally, there’s the ‘%’ sign with FoxifyTM underneath: this triggers the game’s trademark feature, which we’ll discuss later!

This is a fundamentally enjoyable game to play. There’s the constant anticipation of the reels expanding (more on this to follow) but also on-screen characters, firing cannons, and never a second of glitching or slow movement. In terms of player experience, Boom Pirates is top notch.

Graphics and Sound

The game opens with a 6×4 reel, where the rightmost symbols are all locked in stone. The symbols (barrels, pirates, parrots, cannons, and playing card symbols) are extremely basic, but we didn’t really notice: the rest of the game is so engrossing. There are occasional pirate sound effects and a generic swashbuckler’s anthem playing in the background, which is quite pleasant.

While the game is pretty basic, it seems to fit its surroundings really well. Boom Pirates isn’t trying to be ultra cutting-edge in its animations or graphics; instead, it saves all its firepower for the awesome reel expansion and free spins which it’s famous for. Those who enjoy Yggdrasil and NetEnt’s movie-like games might feel disappointed, but run-of-the-mill slots players looking to have fun and generate some cash with love ti!

Overall this is a very enjoyable and easy game to play!

At A Glance

  • Bonus Feature: yes
  • Scatter: Yes
  • Free Spins: Yes

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The game states its RTP as 96.19% and offers a maximum per-spin payout of 3,800x stake. And yet we’re a bit disappointed by the game’s payouts: Boom Pirates has such innovative technology and it is clearly extremely volatile – because during testing we very, very rarely saw any valuable payouts. Lots of players have been finding a similar story, but perhaps we’re just the unlucky ones!

Naturally the best way to trigger these generous payouts is during the free spins round: if the 9×6 grid is triggered early, players could easily win many, many times their stake.

Special Features and Symbols

There are a few noteworthy special features to be found in Boom Pirates:

  • Wonderways™ – This cool feature allows the entire playing grid to grow dynamically during just one spin. From the basic 5×4 grid, the game can expand to 9×6: for a cluster-based payout system, this is an enormous opportunity to cash in! The default grid offers just over 1,000 ways to win. The full-scale grid offers 10 million pay ways!
  • Foxify™ – Without giving players too many specifics, the Foxify feature allows players to wager 50% extra on top of their standard bet, which increases their chances of triggering the free spins round.
  • Mary – Mary is the game’s protagonist, occasionally swinging in from off-screen to slash at the reels and produce a whole crop of wilds and scatter symbols! She can also dish out extra Free Spins (during the bonus round) or offer players the chance to buy additional free spins at a hefty cost!

Free Spins Round

The free spins round is pretty straightforward, but also incredibly exciting! As is usual, players trigger this round by landing 3 scatter symbols in the same spin. It can also be triggered by spending 50x the player’s bet amount! This is a dangerous strategy, however, as there is no guarantee that players will earn their money back.

The 10 free spins begin with the 5×4 symbols available, but distant cannons will occasionally fire into the reels, smashing up stone reels so they become live. Usually there will be 7×6 or more symbols available by the end of the round! We triggered the round once, and won $4,000 from a $50 wager.

At a Glance

  • Slot type: Expanding grid
  • Reels: 5 to 9
  • Scatter: Yes
  • Wild Reel: No
  • Theme: Pirates
  • Ways to win: 1,024 to 1,000,000
  • Bonus Game: Free spins
  • Wild Symbol: No
  • Free Spins: Yes
  • Software: Microgaming


Boom PIrates is an absolutely superb video slot. It offers incredible game mechanics we haven’t ever seen before and implements them in a game which flows seamlessly through its various scenes. The expanding grid is incredibly exciting once it gets to a decent size, since it almost always produces massive results.

The enjoyable theme music and simplistic gameplay are absolute positives, making Boom Pirates easy to play for hours on end. For anyone looking for an exciting new game to play, try giving Boom Pirates a go today!

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