This is our own slot rating based on how popular the slot is, RTP (Return To Player) and Big Win potential.
Play the Big Tuna Bonanza free demo slot—no download required! Try BGaming’s latest game, enjoy risk-free gameplay, explore features, and learn game strategies while playing responsibly. Read our expert Big Tuna Bonanza slot review with ratings for key insights before you play.
Released:August 7 2025
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Big Tuna Bonanza by BGaming is a cheerful fishing-themed slot played on a 5x4 grid with 10 paylines. The game features Fish symbols with cash values and a Fisherman Wild that collects those values during Free Spins. Every 4 Wilds collected retriggers 10 more spins and boosts the win multiplier—first to x2, then x3, and finally x10. With a 97.2% RTP, medium volatility, and a max win of 5,000x, it’s a feel-good slot that builds tension and reward with each cast. Bonus Buy and Chance x2 features add flexibility for players who want faster access to the action.
Big Tuna Bonanza has a layout that consists of 5 reels and up to 10 paylines / ways. The game has several features including Bonus Bet, Bonus Multiplier, Buy Feature, Cash Prize, Collect Symbols, Increasing Multiplier, Level Up, Retrigger, Wilds, and more. Big Tuna Bonanza also has a free spins bonus round and this is usually where you can win the big money.
The standard RTP (Return to Player) for Big Tuna Bonanza slot is 97.2% (Could be lower on some sites). This payback considered very good and higher than average for an online slot. Theoretically, this means that for every €100 put into the game, the expected payout would be €97.2. However, the RTP is calculated on millions of spins, which means that the output for each spin is always random.
The highest possible payout for this slot is 5000x your total bet which is pretty high and gives you the chance to win quite big wins. The maximum possible win is also calculated over a huge amount of spins, often one billion spins.
Big Tuna Bonanza is a medium volatile slot, and BGaming rates the volatility to 3/5. Volatility, in the context of slot games, refers to how often and how much a slot game pays out. Big Tuna Bonanza may not result in the substantial wins that high volatility slots can deliver, but it does provide a more predictable and consistent winning experience. This makes Big Tuna Bonanza a popular choice among players who prefer a game with medium risk.
BGaming nails the fishing theme with Big Tuna Bonanza, offering a polished experience with escalating multipliers and retriggerable Free Spins. The Fisherman Wild mechanic adds excitement, and the 97.2% RTP makes it one of the more generous titles in its category, although it plays it safe in terms of innovation.
This is our own slot rating based on how popular the slot is, RTP (Return To Player) and Big Win potential.
Yes! You can enjoy Big Tuna Bonanza in demo mode without signing up. Try our free version above to explore the features. For real money play, visit one of our recommended BGaming casinos.
To play for real money:
The slot offers a moderate max win of 5000x your stake.
Example: A €1 bet could return up to €5000.
Yes! Most of our featured BGaming casinos on this page offer welcome packages that include free spins or bonus cash usable on Big Tuna Bonanza. Always check the terms before claiming.
Absolutely. The game is fully optimized for mobile devices, including iOS and Android.
Yes, the demo mirrors the full version in gameplay, features, and visuals—just without real money payouts.