Razor Shark vs Big Bass Bonanza

Razor Shark vs Big Bass Bonanza at a glance

On paper these two online slots look like twins: both are five-reel, high-volatility games with a top return to player just under 96.75%. Underneath, they reward completely different things. Razor Shark pays its best when a growing multiplier meets a reel full of revealed sharks, whereas Big Bass Bonanza pays when fisherman wilds land alongside fish carrying cash values. This page sets the specifications side by side, then works through the base game, the free spins, the maths and the UK rules. For more head-to-heads, see our slot comparison hub.

The one row where they really part company is max win. Reel Kingdom publishes a 2,100x ceiling. Razor Shark's game is commonly described as uncapped in theory, so our data deliberately carries no figure for it; that difference shapes everything else about how the two games feel.

How each slot machine plays in the base game

Razor Shark: mystery stacks that slide and reveal

Razor Shark runs on a 5×4 grid with 20 fixed lines. Its signature is the mystery symbol: seaweed-covered stacks four symbols tall that can land on any reel. When they arrive, the Nudge & Reveal feature moves them down one position and then opens them to show either a matching paying symbol or a golden shark. Because every covered position turns into the same thing, a couple of stacks can turn a blank-looking spin into a screen of matching symbols.

Golden sharks revealed from the stacks start Razor Reveal, where the stack spins again and shows coins carrying either a multiplier of the bet or a scatter. Scatters from that step lead into the free games. So the base game is not just waiting for scatters: the mystery stacks are a second route into the bonus.

Big Bass Bonanza: cash fish waiting for a fisherman

Big Bass Bonanza uses a smaller 5×3 grid with 10 lines and plainer line wins built from tackle-box, dragonfly, rod and card-royal symbols. Fish symbols carrying cash values land in the base game but are not collected there; they mainly matter later. The bonus scatter is the gateway. The base game is therefore quieter and easier to read, and most players treat it as the wait for three scatters.

Free spins compared: shark multiplier vs fisherman collection

Both games keep their biggest prizes for the free spins feature, but the two rounds are built on opposite ideas: Razor Shark ends on a timer set by moving reels, Big Bass Bonanza ends when the spin count runs out.

In Razor Shark's free games the progressive multiplier never resets during the round, which is why the game's best results come from long rounds. In Big Bass Bonanza the fisherman is a cash collect wild: each one sweeps up every fish value on screen. Collecting fishermen fills a meter, and every fourth one triggers a retrigger of 10 spins and raises the collection multiplier.

A worked example shows the difference. Suppose you are playing 20p spins. In Big Bass Bonanza, a fisherman landing with three fish worth 2x, 5x and 10x the stake collects 17x, or £3.40, at the base multiplier, and the same catch after the third retrigger would be worth ten times as much. In Razor Shark, a line win worth £1 at a 1x multiplier becomes £6 if five reveals have already pushed the multiplier to 6x. These are illustrations of the mechanics, not typical outcomes.

RTP and volatility: Razor Shark vs Big Bass Bonanza by the numbers

RTP is a long-run average worked out over millions of spins. At 96.70% and 96.71%, the theoretical house edge is 3.30% and 3.29%: a gap so small it would never show up in a normal session. Both are rated high volatility, meaning results swing widely and a session can easily finish well below the average.

The bigger practical issue is which version a casino runs. Our data notes that Razor Shark is also supplied at 95.05% and lower, which would raise the theoretical cost of 100 spins at £1 from £3.30 to £4.95. This is normal practice in the industry; our explainer on RTP variants shows why studios offer several settings. Under the Gambling Commission's rules on game descriptions and the likelihood of winning (opens in a new tab), the return should be available in the game information, so you can always look it up.

Neither developer publishes a hit frequency or bonus trigger rate that we hold, so we don't quote one. Treat any figure you see elsewhere as an estimate from simulated spins.

Cost per 100 spins on each online slot

The table converts RTP into money. It shows how much you would stake over 100 spins and the average amount the house edge would take at each top RTP. Real sessions will be higher or lower, often by a lot, because of the volatility.

At UK spin speeds of at least 2.5 seconds, 100 spins take a little over four minutes of pure spinning, so an hour at 50p could put several hundred pounds through either game. Our slot cost calculator lets you test your own stake and session length.

Max win at UK stake limits

Under the online slot stake limits, the most anyone can stake per spin in Great Britain is £5 if aged 25 or over and £2 if aged 18 to 24 (the 18–24 stake limit has applied since 21 May 2025). Here is what the published ceilings mean in pounds.

Razor Shark shows 'No fixed figure' because the game is widely described as uncapped, and we only state ceilings we can verify. A theoretical lack of a cap does not mean bigger wins are likely: very large multipliers depend on unusually long bonus rounds. Our page on max win caps explains how ceilings are set and why they matter for volatility.

How to check the RTP and rules before you spin

Because the same game can be supplied at different settings, a quick check is worth the minute it takes. The steps are similar for both slots.

1. Open the game in your casino and, before staking, tap the menu or the 'i' icon.
2. Find the game rules or help screen and search the text for 'return to player' or 'RTP'.
3. Compare the figure with the top setting: 96.70% for Razor Shark, 96.71% for Big Bass Bonanza.
4. Read the free spins rules: for Razor Shark, how the multiplier grows; for Big Bass, the retrigger steps.
5. Set your stake within your limit and a session budget before the first spin.

Our step-by-step guide on how to find a slot's RTP has screenshots-in-words for the most common game menus.

UK rules that shape both online slots

The versions of Razor Shark and Big Bass Bonanza offered in Great Britain run under the same game design rules. Since 31 October 2021 there has been no autoplay, a minimum 2.5 seconds per spin, no turbo or slam-stop, and no celebration of a return equal to or less than the stake; the Commission's summary of the slot design changes (opens in a new tab) lists the exact wording. Our page on the autoplay ban explains what that means at the screen.

• Stake limits: £5 per spin for 25+, £2 for 18–24, set out in the Commission's online slots stake limit guidance (opens in a new tab).
• Feature buys are not offered on these games at UK-licensed casinos; see bonus buy in the UK.
• Demo versions are free to play only after age verification, a rule in place since May 2019.
• Your balance and net position stay on screen throughout play.

Myths about Razor Shark and Big Bass Bonanza

Two very visual features attract plenty of folklore. Here is what is true.

• 'A half-visible mystery stack means a big reveal is close.' No. The outcome of each spin is fixed by the random number generator before the reels stop; the animation only shows it. See near misses.
• 'Lots of fish in the base game means free spins are due.' Fish values in the base game don't build towards anything, and no slot is ever 'due'.
• 'Higher stakes trigger the bonus more often.' Stake size changes the value of wins, not the chance of a trigger.
• 'The 0.01% RTP gap makes Big Bass better value.' Over 100 spins at £1 the difference is 1p on average.

Which slot suits which player

Verdict for players who like a readable game: Big Bass Bonanza, because the target (scatters, then fishermen) is obvious. For players who enjoy busy reels: Razor Shark, as the stacks keep the grid changing. For small budgets: neither is ideal; our guide to slots for small budgets explains why high volatility and short sessions don't mix. For players who compare fishing games: see our fishing slot machines guide and the Big Bass Bonanza vs Bigger Bass Bonanza comparison.

Sequels and similar slots

Push Gaming followed Razor Shark with Razor Returns, and its studio page on Push Gaming lists related titles such as Jammin' Jars. Reel Kingdom has built a whole series on the fisherman; Big Bass Splash and Bigger Bass Bonanza are the best-known follow-ups, and the studio profile for Reel Kingdom explains its partnership with Pragmatic Play (opens in a new tab). The fisherman symbol page traces how the collector wild spread across the genre.

Where to play Razor Shark or Big Bass Bonanza in the UK

Big Bass Bonanza is the game that PlayOJO's welcome spins are played on: new UK customers (excluding Northern Ireland) who make a first deposit of at least £10 get 80 free spins worth 10p each, with winnings paid in cash and no wagering. Coral's current offer is bet £10 on slots and get 100 free spins (10p each, selected games, 7 days to use them), and Ladbrokes gives new customers who play £10 on slots 50 free spins a day for 10 days (up to 500, 10p each, claimed by 23:59 each day, no wagering). All three are 18+, terms apply, and certain payment methods don't qualify. Beyond PlayOJO's offer spins, we can't promise either game is in a given lobby, so search the casino's lobby; game availability changes. Details of each operator are on our PlayOJO page and the Big Bass Bonanza free spins explainer.

Whichever you choose, treat it as paid entertainment, set a deposit limit first, and use GAMSTOP or the National Gambling Helpline via GamCare (opens in a new tab) (0808 8020 133) if play stops being fun.

18+. Gambling should be entertainment that costs money, not a way to make it. Decide a budget before you play: plan a slot budget. Free, confidential help: National Gambling Helpline 0808 8020 133.