Butterfly Staxx slot review

What kind of game the Butterfly Staxx slot is

Butterfly Staxx is a gentle, line-based NetEnt slot from 2017 whose whole personality rests on one idea: tall stacks of the top symbol that can cover a reel and then creep sideways across the grid. There are no jackpots, no gamble button and no multiplier ladder. What you get instead is a game that returns small and mid-sized wins fairly often, with an occasional respin chain that fills much of the screen with butterflies.

That design puts it in the same family as the studio’s calmer classics. It sits close to low volatility slots in feel, and its 640x ceiling tells you the maths was never aimed at enormous single results. If you want a slot to read a book next to, it fits; if you want a lottery ticket, it does not.

Theme, symbols and sound

The look is a soft, colourful garden. Brightly coloured flowers make up the higher-paying symbols, while the low end uses the A, K, Q and J card ranks. The butterflies are the stars: large, vividly patterned and the most valuable symbol on the reels. The presentation is calm rather than flashy, which suits the slow, relaxed pacing.

A wild symbol substitutes for the ordinary paying symbols, and a separate scatter opens the free spins. Because there are only a handful of premium symbols, you quickly learn which landings matter: anything involving a butterfly stack is the moment to watch. You can read every symbol value in the game’s paytable, which scales with your chosen stake.

How to play Butterfly Staxx step by step

1. Open the game’s info screen and note the RTP shown there, since a casino can run a lower version than the 96.80% default.
2. Set your total stake with the bet controls. All 40 lines are always active, so you only choose the stake size, never the number of lines.
3. Press spin. UK rules mean each spin takes at least 2.5 seconds and there is no autoplay or turbo button.
4. Watch for butterfly stacks. If one covers an entire reel, the respin feature starts automatically.
5. Land three or more scatters anywhere to open the free spins round, then let it play out.
6. Keep an eye on the balance and net position display, which UK slots must show at all times.

Butterfly Respins: the main feature explained

Butterflies appear as stacked symbols, so several can land on top of one another on the same reel. When a stack covers all four positions of a reel, the respin feature triggers. NetEnt’s description of the sequence is straightforward: the butterflies shift one reel to the left, every other position spins again, and any new butterflies that land also shift left. The process repeats until a respin produces no new butterflies, and only then are wins counted.

In practice this means a single full stack on reel 5 can travel across the grid, dragging fresh butterflies with it, and you can finish with two or three reels largely covered in the top symbol. Because the game pays on 40 lines, a reel of four butterflies next to another full reel creates many overlapping line wins at once, which is where the bigger results in the base game come from.

The respin chain is not a separate bonus with a set number of spins. It simply continues while butterflies keep landing, so some chains stop after one respin and others run for several.

Butterfly Staxx free spins and the cocoons

Three or more scatter symbols anywhere on the grid trigger the free spins round, with no payline needed. NetEnt’s game page says the round awards between five and seven spins depending on how many scatters you land, which is a short round by modern standards.

What changes during the free spins is the symbol mix. Cocoons appear on the reels, some active and some dormant, and active cocoons transform into butterflies. Those new butterflies can complete stacks and set off the same left-shifting respins as the base game. The round is therefore less about a multiplier and more about seeding the grid with extra butterflies so the respin chains start more often.

Because it is short and has no multiplier, the free spins round rarely produces outsized results. It is better thought of as a higher-density spell of the base game’s best mechanic. For a broader explanation of how rounds like this are built, see how slot features trigger.

Butterfly Staxx RTP: what 96.80% means in pounds

An RTP of 96.80% means that over a very large number of spins the game is designed to pay back £96.80 for every £100 staked, leaving a house edge of 3.20%. Over a single evening the real result can sit well above or below that line. The table turns the figure into theoretical costs for a few realistic sessions.

Low-to-medium volatility is why those averages feel closer to reality here than on a high-variance game. Wins land often enough that a £20 balance at 20p a spin will usually last a fair while, yet the house edge still applies to every pound, and losses over time are the expected outcome. If your casino runs a lower RTP version, the cost rises: at 94% the 300-spin session above would cost £9 in theory rather than £4.80.

The 640x max win and how often big wins appear

The max win on Butterfly Staxx is 640 times your total stake. At 10p that is £64, at 50p it is £320 and at the £5 UK cap for players aged 25 and over it would be £3,200. Those figures are the absolute ceiling, reached only when a respin chain covers the grid in butterflies, and most sessions will never come close.

A low ceiling is a trade-off rather than a flaw. Games that can pay 10,000x or more must take that money from somewhere, usually from frequent small wins. Butterfly Staxx does the opposite: it spreads its return across many modest hits. Expect most wins to be fractions of your stake or a few times it, with respin chains occasionally reaching a few dozen times the bet.

UK rules that shape how Butterfly Staxx plays

• Stake limits: £5 a spin maximum if you are 25 or over, and £2 if you are 18 to 24.
• Speed: at least 2.5 seconds per spin, with no turbo, quick-spin or slam-stop.
• No autoplay: every spin needs a separate press.
• No celebrations for returns smaller than your stake, which matters on a 40-line game where many wins are small.
• Feature buy is not offered in Great Britain, though Butterfly Staxx has no buy option anyway.
• Demo play is only available after age verification at a licensed casino.

The rule on celebrations is especially relevant here. With 40 lines, it is common to win back less than you staked on a spin, and UK slots must not dress that up as a win. The net position display shows how your session is really going. Our UK slot rules guide covers the full list.

Butterfly Staxx compared with similar slots

The obvious comparisons are other calm, frequent-hitting games and one slot that uses the same 5×4, 40-line frame with very different maths.

Starburst is the closest relative in spirit: a low ceiling, regular wins and a respin feature built around a single special symbol. Blood Suckers has a higher published RTP, which lowers the theoretical cost per £100. Wild West Gold shows how much difference maths makes: the same grid and line count, but high volatility, so sessions are far bumpier.

Pros, cons and who Butterfly Staxx suits

Butterfly Staxx suits players who prefer longer, quieter sessions at small stakes and who value a clear, single mechanic. It is a reasonable first slot for someone learning how volatility shapes a session, because you can see the frequent small returns in action. It does not suit anyone hoping for a very large single result.

NetEnt later released Butterfly Staxx 2, which builds on the same butterfly idea. Check its own info screen for figures rather than assuming they match the original.

Where to play Butterfly Staxx in the UK

NetEnt games are carried by many UKGC-licensed casinos, but search the lobby and check the RTP in the help screen before depositing. PlayOJO gives new UK customers 80 free spins on Big Bass Bonanza, 10p each, after a first deposit of £10 or more, with winnings paid as cash; Coral gives 100 free spins at 10p after a £10 slots bet (deposit type restrictions apply, 7-day expiry) and Ladbrokes gives up to 500 free spins, 50 a day for 10 days, after £10 on slots, both with no wagering. 18+, T&Cs apply.

18+. Gambling should be entertainment that costs money, not a way to make it. Set a deposit limit before you play: how to set limits. Free, confidential help: National Gambling Helpline 0808 8020 133.