The Big Bass Halloween slot is Reel Kingdom’s spooky spin on its fishing series: a 5×3 game with 10 paylines, a 96.04% RTP, medium-high volatility and a 2,100× maximum win. As in the other Big Bass games, everything centres on free spins, where the Fisherman wild collects the cash values on fish symbols.
96.04% RTP is lower than the 96.71% that several Big Bass games offer at their top setting.
Three, four or five scatters give 10, 15 or 20 free spins.
Every four Fishermen collected retriggers the round with 10 more spins and a higher fish multiplier.
The 2,100× ceiling is modest for the series, which suits players who prefer a narrower range.
Developer
Reel Kingdom (distributed by Pragmatic Play)
RTP
96.04%
Volatility
Medium-high
Layout
5 reels × 3 rows
Paylines
10 paylines
Max win
2,100× stake
Released
2023
Big Bass Halloween slot at a glance
Reel Kingdom released Big Bass Halloween in 2023, and Pragmatic Play distributes it to casinos. The studio is best known for the Big Bass series, which took off with Big Bass Bonanza on 14 December 2020, and its signature mechanic is the Fisherman wild that collects fish cash values. Our Reel Kingdom slots page covers the rest of its catalogue.
Big Bass Halloween specifications
Detail
Big Bass Halloween
Developer
Reel Kingdom
Distributor
Pragmatic Play
RTP
96.04%
House edge
3.96%
Volatility
Medium-high
Layout
5 reels × 3 rows
Paylines
10
Free spins
10, 15 or 20 from 3, 4 or 5 scatters
Max win
2,100× stake
Released
2023
The Halloween theme is new, but the structure follows the series closely. If you have played another Big Bass game, the free spins round will feel familiar.
How the features work in Big Bass Halloween
The base game is a plain 10-line slot. The free spins round is where the collect mechanic comes alive.
Leaping bass scatters
Scatters pay no attention to paylines. Land three, four or five of them anywhere and you get 10, 15 or 20 free spins respectively.
Fish money symbols and the Fisherman
Once free spins begin, fish money symbols can land showing cash amounts. When the Fisherman wild lands, he collects the values of every fish money symbol in view at that moment. If he lands with no fish showing, a dynamite feature can add fish to the reels so he has something to collect.
The Fisherman trail and retriggers
Each Fisherman you land is recorded on a trail above the reels. Every fourth one retriggers the round, adding 10 more spins and raising the multiplier applied to fish values. The game’s help screen lists the multiplier at each stage.
A free spins round, step by step
Three, four or five scatters land and award 10, 15 or 20 free spins.
Fish money symbols can appear on the reels, each showing a cash value.
A Fisherman wild lands and collects the value of every fish in view.
If no fish are showing, the dynamite feature may add some for him to collect.
Each Fisherman fills a space on the trail; every fourth adds 10 spins and a higher fish multiplier.
Big Bass Halloween RTP and volatility on a £20 budget
An RTP of 96.04% means a house edge of 3.96%, or about £3.96 lost for every £100 staked over the long run. Medium-high volatility means the base game can go quiet for a while, with most of the return tied up in free spins.
£20 in Big Bass Halloween
Stake
Spins from £20 with no returns
Average cost per spin
2,100× at this stake
10p
200
0.40p
£210
50p
40
1.98p
£1,050
£1
20
3.96p
£2,100
At 10p, a £20 budget allows 200 spins before any returns, which gives the scatters plenty of chances to land, though they are never due. At £1 it is only 20. The house edge is the same at every stake; only the speed at which a budget is used up changes.
Compared with the 96.71% several Big Bass games offer, this RTP costs an extra 67p per £100 staked on average. That is small per session but adds up over months. Wizard of Odds’ guide to slots (opens in a new tab) explains how RTP and volatility interact.
Big Bass Halloween vs other Big Bass slots
Reel Kingdom has built a long series on the same fishing idea. These are the published figures for games we review, with Big Bass Halloween in the first row.
The Halloween game shares Big Bass Bonanza’s 2,100× ceiling but has a slightly lower RTP and a softer volatility rating. If the theme does not matter to you, the higher-RTP versions cost less over time. A sequel, Big Bass Halloween 2, came out in 2024 with a published top RTP of 96.71% and a 5,000× maximum.
Playing Big Bass Halloween on iPhone and Android
The game is built in HTML5, so it runs in casino apps and mobile browsers on both iPhone and Android. Reel Kingdom does not say whether it favours portrait or landscape. A 5×3 grid with 10 lines is one of the easiest layouts to read on a phone, and the fish values are the main thing to watch.
You need a UK-licensed app from the official store; our guides to installing on Android and downloading on iPhone show how to check you have the real one. Age and identity checks come before any deposit or demo play. Then search the lobby by name, because not every app carries every seasonal title.
UK rules for the Big Bass Halloween slot
Versions supplied to British casinos follow the Gambling Commission’s RTS 14 responsible product design standard (opens in a new tab): no autoplay, at least 2.5 seconds per spin, no turbo or slam-stop, and no celebrating a return that is equal to or below your stake. You tap to start every spin, including in the base game.
Fans of the Big Bass series who want the same collect mechanic with a seasonal theme.
Players who prefer a lower ceiling and slightly softer volatility than the series’ high-volatility titles.
Phone players who like a simple 5×3 layout with one main feature to follow.
Less suited to anyone focused on long-run cost, since several sister games have a higher RTP. Our high RTP slot apps page covers that angle.
Big Bass Halloween review: pros and cons
Advantages
Proven Fisherman collect mechanic, easy to follow
Clear scatter rule: 3, 4 or 5 give 10, 15 or 20 spins
Retriggers add spins and raise the fish multiplier
Simple 5×3 grid suits small screens
Drawbacks
96.04% RTP trails the 96.71% of several Big Bass games
2,100× maximum is low for the series
Base game is plain, with the action saved for free spins
Medium-high volatility can mean long waits for scatters
Where to play Big Bass Halloween with a welcome offer
The closest link between this game and our partner offers is PlayOJO’s welcome spins, which are on Big Bass Bonanza, the game that started the series. None of these offers can be used on Big Bass Halloween itself, and we cannot confirm which apps list it. Each offer is limited to new customers aged 18 and over, with terms applying.
PlayOJO: 80 free spins on Big Bass Bonanza, 10p each, after a first deposit of £10 or more. Because there is no wagering, anything won is paid as cash. New UK customers excluding Northern Ireland; not combinable with other offers and available only via the designated offer link.
Coral Casino: deposit (certain types excluded) and bet £10+ on slots for 100 free spins at 10p each on selected games. You get 48 hours to accept and 7 days to use them, with no wagering on winnings. Neteller, PayPal, Paysafe, Skrill, prepaid cards and certain debit cards don’t qualify. Available 1 October 2026 to 1 February 2027.
Ladbrokes Casino: deposit and spend £10 or more on slots for 50 free spins a day for 10 days, 500 at most, each worth 10p on selected games. Claim each day’s spins before 23:59 and use them within 7 days; no wagering. Prepaid card, PayPal, Paysafe, Neteller, Skrill and Moneybookers deposits don’t count.
One company, LC International Limited, operates both Coral and Ladbrokes, which may limit you to a new account at just one of them. Our PlayOJO slots app page has more on its slot lobby.
PlayOJO’s spins are on Big Bass Bonanza, a different game in the same series; none of these offers is on Big Bass Halloween. 18+, terms apply.
Coral and Ladbrokes are both run by LC International Limited (Entain). If you already hold an account with one Entain brand, you may not be able to open another; check the terms first.
Significant terms: 18+. New UK customers (excluding Northern Ireland). First deposit only. Minimum deposit £10. 80 free spins on Big Bass Bonanza, £0.10 each. No wagering requirements; winnings paid in cash. Cannot be used with any other offer. Only available to players who arrive through the designated offer link. Full T&Cs apply. GamCare.org.uk
Read our PlayOJO app reviewLicence: Skill On Net Limited, Gambling Commission account 39326. Offer checked 5 October 2026.
Significant terms: 18+. New players only. Offer runs 01/10/2026 to 01/02/2027. Deposit (certain types excluded) and bet £10+ on slot games to get 100 free spins (selected games, £0.10 each, 48 hrs to accept, valid 7 days). No wagering on free spin winnings. Deposits by Neteller, PayPal, Paysafe, Skrill, prepaid cards and certain debit cards do not qualify. Restrictions and T&Cs apply. GamCare.org.uk
Read our Coral app reviewLicence: LC International Limited, Gambling Commission account 54743. Offer checked 5 October 2026.
Time limitClaim daily for 10 days; each batch valid 7 days
Worked valueUp to 500 spins at £0.10 (up to £50 in spins)
Significant terms: 18+. New customers only, from 14/11/25 until further notice. Certain deposit methods excluded. Deposit and spend £10+ on slots for 50 free spins a day during the first 10 days after first deposit and registration (max 500, £0.10 each, selected games, claim before 23:59 each day, valid 7 days). No wagering. Prepaid cards, PayPal, Paysafe, Neteller, Skrill and Moneybookers deposits do not qualify. Restrictions and T&Cs apply. GamCare.org.uk
Read our Ladbrokes app reviewLicence: LC International Limited, Gambling Commission account 54743. Offer checked 5 October 2026.
18+. Every casino game has a built-in house edge, so over time you should expect to lose what you stake. Set a budget before you play and stop when it’s gone: safer gambling tools and support. Free, confidential help: National Gambling Helpline 0808 8020 133.
Frequently asked questions
What is the RTP of Big Bass Halloween?
The published RTP is 96.04%, a house edge of 3.96%. That averages about £3.96 lost for every £100 staked over a very long run, though sessions vary widely. It is a little lower than the 96.71% several other Big Bass games offer at their top setting. Casinos can run different versions, so confirm the figure on the game’s help screen. Our guide to finding a game’s RTP in an app shows which screen to open.
How many free spins do you get on Big Bass Halloween?
You get 10, 15 or 20 free spins for landing three, four or five scatter symbols. During the round, every fourth Fisherman you collect on the trail above the reels retriggers it with 10 extra spins and a higher multiplier on fish values. Since a Gambling Commission warning in January 2020, feature buy-ins are not offered to British players, so scatters are the only way in. See the free spins glossary entry for how the feature differs from a casino promotion.
What is the max win on Big Bass Halloween?
The maximum win on Big Bass Halloween is 2,100 times your stake, which works out at £210 at 10p a spin or £2,100 at £1. That matches Big Bass Bonanza but is lower than several later games in the series, such as Big Bass Splash at 5,000×. It is a ceiling written into the game, not an expected result, and losses are the likely outcome over time. Our Big Bass Splash review shows a higher-ceiling alternative.
How does the Fisherman work in Big Bass Halloween?
The Fisherman is a wild that appears during free spins and collects the cash values shown on every fish money symbol in view when he lands. If he lands with no fish on screen, a dynamite feature can add some for him to collect. Each Fisherman is also counted on a trail, and every fourth one retriggers the round with 10 more spins and a higher fish multiplier. Our Reel Kingdom slots page explains how the studio uses this mechanic.
Is Big Bass Halloween different from Big Bass Bonanza?
Yes, although they share the same core idea. Both use the Fisherman collect mechanic and have a 2,100× maximum win, but Big Bass Halloween has a lower published RTP of 96.04% against 96.71%, and a medium-high rather than high volatility rating. The Halloween game also has its own dynamite feature, which can add fish when a Fisherman lands without any. PlayOJO’s welcome spins are on Big Bass Bonanza, not this game. Read our Big Bass Bonanza review for the comparison.
Can I play Big Bass Halloween on my phone?
Yes, it is an HTML5 slot, so it works in UK casino apps and mobile browsers on iPhone and Android. You need a verified UK account, and the game must be in your chosen app’s lobby, which varies between casinos. The 5×3 grid and 10 lines are easy to read on a small screen. Even the demo version requires age verification first. Our overview of slots on mobile explains how phone play differs from desktop.
Is Big Bass Halloween high volatility?
It is rated medium-high volatility, a step below the high or very high rating of several other Big Bass games. In practice, the base game can be quiet for spells, with much of the return concentrated in free spins. Volatility changes the ride but not the long-run cost, which comes from the 96.04% RTP. A 10p stake gives a £20 budget 200 spins before any returns. Our answer on what volatility means on a slot app has more.
Is there a Big Bass Halloween 2?
Yes, Reel Kingdom released Big Bass Halloween 2 in 2024. Its published figures show a top RTP of 96.71%, with 95.67% and 94.6% versions also in use, 10 fixed paylines on a 5×3 grid and a 5,000× maximum win. Its free spins add a wild progress bar, multipliers and optional modifiers. Because lower RTP versions exist, check the help screen in your app. Our full list of mobile slot reviews covers more of the series.
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