Slots Like Pirots 4: Four Space Birds and a 10,000x Ceiling

Pirots 4 launches ELK Studios’ collector bird series into orbit, swapping the wild west setting of Pirots 3 for a 6 reel, 6 row space station where four birds patrol the grid hunting matching gems. The CollectR system stays the same at heart, birds move around the board gathering gems and feature symbols of their own colour until none of them can collect anything else, then everything drops and refills for another pass. A collection meter tracks every gem gathered and queues up to three pending feature symbol releases, while Switcheroo and Power Clash keep stuck birds active by swapping positions or clashing for extra value. New to this entry are Alien Invasion, a UFO that beams up symbols mid round, and Lost in Space, a standalone mini game reached through the same feature symbol system. The RTP sits at 94%, volatility runs medium-high, and the ceiling on wins tops out at 10,000 times the stake.

Where to Play

18+ only. T&Cs apply. Please gamble responsibly.

How the Game Works

Reviewed by Paul Stone
Published: July 2026

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Symbols drop into the 6×6 grid each round while four birds, one per gem colour, move across the board collecting matching gems and any feature symbols in their path. A bird keeps moving as long as it can still collect something nearby, and it is allowed to move more than once before the grid needs a refill. Collected and activated positions are cleared, everything above falls to fill the gap, and the whole process repeats for as long as at least one bird has somewhere left to go.

The four gem symbols themselves scale in value as they level up, paying as little as 0.05x at their lowest level and as much as 30x once fully upgraded, with a matching wild able to substitute at whatever level it currently holds.

Feature Symbols and the Collection Meter

Every gem or wild a bird collects also feeds a collection meter, and filling it queues a pending feature symbol release, with as many as three able to stack up before they are all delivered together. Feature symbols themselves cover a wide spread of effects: Upgrade and Upgrade All raise gem values, Transform reshapes a cluster into a single colour, Spacecorn lets birds cross an empty tile to reach symbols beyond it, and Black Hole absorbs both symbols and birds before flinging them back out somewhere else on the grid.

Switcheroo, Power Clash and Charlie’s Extra Chance

When two adjacent birds both run out of things to collect, a Switcheroo swaps their positions to open up fresh opportunities, while a Power Clash version of the same idea adds extra value into the mix. If a bird ends a round unable to collect anything at all, Charlie’s Extra Chance can step in instead, dropping 1 to 4 corner bombs that clear space and trigger a fresh symbol drop.

Alien Invasion and Lost in Space

Alien Invasion sends a UFO sweeping across the grid mid round, beaming up a column of symbols and swapping them out for something new, adding a genuinely chaotic new layer that earlier Pirots games did not have. Lost in Space works differently again, a standalone mini game reached through the same pending feature symbol system that plays out away from the main grid entirely before handing control back.

Bonus Game and Free Spins

Collecting three scatters with the birds during the base game triggers 5 free spins at whatever grid size the round had already reached, with every further scatter collected during the bonus adding one more spin. Grid size, collection meter progress and gem upgrade levels all carry over from the base game and stay locked in for the round. Landing a super bonus symbol among those scatters swaps the standard bonus for the Super Bonus Game instead, played out on a maxed 8×8 grid with every upgrade symbol affecting all four gem colours at once.

X-iter Feature Buys

Five X-iter tiers let players buy into different parts of the feature set directly: a 3x stake buy quadruples the chance of a natural bonus trigger, 25x guarantees Alien Invasion, 50x guarantees Lost in Space, 100x guarantees the regular Bonus Game, and 500x guarantees the Super Bonus Game played on the full 8×8 grid with every upgrade symbol active.

Pros and Cons

Pros

• Alien Invasion and Lost in Space genuinely expand the CollectR formula rather than just reskinning it
• Five separate X-iter tiers give players precise control over which feature they buy into
• The Super Bonus Game on an 8×8 grid offers real top end potential beyond the standard bonus
• Persistent grid size and gem upgrades across the bonus round reward sustained play
• The space setting is a confident visual departure from the earlier games in the series

Cons

• A 94% RTP sits below several rival collector style slots
• The sheer number of feature symbols and mechanics can overwhelm players new to the series
• A 10,000x ceiling is solid but well short of the highest paying slots on the site
• Fans of the Wild West setting from Pirots 3 may find the tonal shift a little jarring

Game Screenshot

Pirots 4 keeps that same 94% RTP build in its free demo, but with so many feature symbols in the mix, it usually takes several rounds before Alien Invasion and Lost in Space actually show up. That groundwork is worth doing on our free demo slots page before switching to real stakes.

Expert Take

Reviewers covering Pirots 4 have generally praised the decision to send the series to space rather than simply reskinning the CollectR formula again, with Alien Invasion in particular singled out as a genuinely fresh addition. The sheer density of feature symbols draws some criticism for overwhelming newcomers, but for players already familiar with the series it is widely seen as the most feature rich entry yet.

Similar Slots to Try

Whether it is the ELK Studios collector format, the space setting or the wider alien theme that brought you here, these seven cover the ground.

• Kaiju
  
  Another ELK Studios release with its own creature roster and layered feature symbols, a close relative in house style.
• Hong Kong Tower
  
  A vertical, feature dense ELK Studios slot that shares the studio’s taste for stacked, persistent mechanics.
• Reactoonz
  
  An alien themed cluster pays slot with its own quantum leap and energy symbol mechanics, a strong thematic match.
• Moon Princess
  
  A space set cluster slot with its own trio of collectible heroines, worth a look for fans of the sci-fi setting here.
• Pirots 3
  
  The previous entry in the same ELK Studios series, running a slightly simpler version of the collecting bird mechanic. The most direct comparison for seeing how the format has evolved into Pirots 4.
• Tiki Tumble
  
  Also built on a cascading grid with its own climbing multiplier, but in an earlier, far less layered ELK Studios package than the Pirots series has become.
• Coba Reborn
  
  A jungle temple replaces the alien frontier here, with a Snake Progress Meter and crossing-wild multipliers standing in for the studio’s usual resource collector format.
• Space Donkey
  
  Nolimit City answers Alien Invasion with an 8-bit invasion of its own, six reels by six rows of cascading pixel art, a sticky Abduction Wild and a 14,649x cap. Louder and meaner than ELK’s collector, but pitched at the same players who came here for the space setting.
• Agnes Mission Wild Lab
  
  Foxium runs a collect mechanic of its own, with Agnes Coins gathering on an Extra Reel above the grid to feed four jackpot tiers. It tops out at the same 10,000x as Pirots 4 but trades cheerful birds for sci-fi horror, so try it if the alien half of this game appealed more than the cartoon half.

About the Developer

Pirots 4 comes from ELK Studios, the Swedish developer behind the entire Pirots series since its 2023 debut. What began as a swashbuckling collector format has since visited a dinosaur theme park, the Wild West, and now outer space, with the core CollectR mechanic evolving a little further with each release. See more on our Elk Studios slots page.

Pirots 4 Key Stats

Pirots 4 slot information last reviewed: July 2026

Slots with the Same Features

Two feature tags run through this page, matched to a couple of picks below.

Slots with Money Collect

Slots where the whole point is chasing a running total across the grid rather than a single line payout, the same principle driving the birds here.

Slots with a Bonus Buy Option

Titles that let players pay directly for a shot at their feature round, the same choice Pirots 4 offers through its X-iter menu.

Frequently Asked Questions

How does the CollectR system work in Pirots 4?

Four birds move around the 6×6 grid collecting gems and feature symbols of their own colour. A bird keeps moving as long as it can collect something, and once no bird can move, collected positions clear, symbols drop to refill the grid, and the process repeats.

What do Alien Invasion and Lost in Space do?

Alien Invasion sends a UFO across the grid mid round to beam up and swap out a column of symbols. Lost in Space is a separate mini game reached through the same pending feature symbol system, playing out away from the main grid before returning control.

How does the Bonus Game work?

Collecting 3 scatters triggers 5 free spins at the base game’s current grid size, with each further scatter collected during the bonus adding an extra spin. Landing a super bonus symbol instead triggers the Super Bonus Game on a maxed 8×8 grid.

What is the RTP of Pirots 4?

The default RTP is 94%, the standard configuration ELK Studios publishes for this release.

What is the maximum win on Pirots 4?

The maximum win is 10,000 times the stake, reached most reliably through a strong Super Bonus Game round on the full 8×8 grid.

Can you buy features in Pirots 4?

Yes, the X-iter menu offers five tiers from 3x stake up to 500x stake, guaranteeing anything from a quadrupled bonus chance up to the full Super Bonus Game.

Who makes Pirots 4?

ELK Studios, the Swedish developer behind the entire Pirots series since 2023. This fourth entry launched in July 2025 with a space setting.

Our Verdict on Pirots 4

Pirots 4 takes a genuine risk sending an established series into space, and for the most part it pays off, with Alien Invasion and Lost in Space adding real texture to a CollectR formula that could easily have coasted on reputation alone. The feature set is dense, arguably too dense for players coming to the series fresh, but the persistent grid, stacking feature symbols and layered X-iter menu reward the patience needed to learn it. A 94% RTP and a 10,000x ceiling are solid rather than spectacular, yet the sheer depth on offer here makes a strong case for this being the most complete Pirots game so far.

SlotsLike rating: 8/10