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Game Overview

Big Bonus Booster is a slot machine game developed by Inspired Entertainment. The game consists of multiple features including standard spins, bonus rounds, free spins, a gamble feature, and a special betting mode called Fortune Bet.

Symbols And Payouts

Payouts are based on the current bet level and are subject to change.

Symbol	6x	5x	4x	3x
Red 7	£15	£5	£2	£0.50
Crown	£20	£6	£2	£0.50
Wild	£250	£15	£4	£1
Plum	£8	£3	£1	£0.20
Watermelon	£8	£3	£1	£0.20
Silver 7	£10	£4	£1.50	£0.40
Blue 7	£10	£4	£1.50	£0.40
Cherry	£5	£2	£0.50	£0.10
Lemon	£5	£2	£0.50	£0.10
Orange	£5	£2	£0.50	£0.10
Grapes	£5	£2	£0.50	£0.10

Wins are achieved by matching 3, 4, 5, or 6 symbols across adjacent reels on a valid win line, starting with the leftmost reel.

Wild Symbol

• The Wild symbol substitutes for all symbols except Bonus Scatter.
• It appears on all reels in the base game and on reels 2, 3, 4, and 5 in the Free Spins Bonus.
• During free spins, any Wild symbol in view will lock in place until the bonus is completed.

Win Lines

• The game features 50 win lines.
• Wins can occur across any or all of the win lines.
• Only the highest award is paid per winning combination.
• All wins pay left-to-right across adjacent reels, except Bonus, starting from the leftmost reel.
• Wins on different played lines are added.

Big Bonus Entry

• Bonus symbols can appear on all reels in the base game.
• Landing 3 or more Bonus symbols anywhere in view starts the Big Bonus.
• The starting Big Bonus value is determined by the pick-me round:
  • 3 Bonus Symbols: Value can be 20X, 25X, 30X, 50X, or 100X.
  • 4 Bonus Symbols: Value can be 25X, 30X, 50X, or 100X.
  • 5 Bonus Symbols: Value can be 30X, 50X, or 100X.
  • 6 Bonus Symbols: Value can be 50X or 100X.

Big Bonus Match 3 Pick Me

• Determines the Big Bonus value.
• The game presents 6, 9, 12, or 15 identical tiles depending on the number of triggering Bonus symbols.
• Players select tiles to uncover Big Bonus gems.
• Matching 3 gems starts the bonus with that value.

Free Spins Information

• The Big Bonus trail is carried over from the pick-me round.
• Landing Big Bonus Booster gems on reel 6 adds to the trail.
• Filling the active trail segment with Booster gems upgrades the Big Bonus value.
• Only gems from the active trail segment appear on reel 6.
• During free spins, any Wild symbol that lands in view will lock in place until free spins end.
• Free spins continue until a win which is greater than or equal to the Big Bonus value is achieved.

Fortune Bet

• Fortune Bet mode can be activated by pressing the Fortune Bet button.
• During Fortune Bet, the bonus is awarded 50% more frequently.
• The awards, Big Bonus value, gamble entry, and thresholds remain the same as the base stake.

Gamble Feature

• The gamble can be configured to be on, on if the win is greater than or equal to 5x stake, or off.
• If on, any winnings can trigger the gamble feature. If the win is ≥5x stake, the gamble feature is also offered.
• Two wheels are presented:
  • The left wheel allows increasing winnings by half, doubling, or tripling.
  • The right wheel offers the chance to win entry to the Big Bonus; win value can be adjusted.
• If the pointer stops on the green segment, the cash value or Bonus is awarded; if on red, the player loses winnings.
• Winnings can be gambled up to x2500 base stake or £50,000 (whichever is lower).
• A maximum of 6 Scatters can be achieved in the gamble for the Bonus wheel.
• Press ‘COLLECT’ to collect winnings at any time.
• The expected payback for the gamble feature is shown in-game.

Spin Chance

• Triggered if credit drops below the current play price but is above zero.
• Offers a chance to wager remaining credit for a spin at the current bet.
• Select ‘PLAY’ to attempt, or ‘NO THANKS’ to exit with the remaining credit.
• If the pointer stops on green, a spin at the current bet is awarded; if on red, the player loses remaining credit.

Main Game Controls

• Spin: Starts play at the current stake value.
• Stake: Opens the stake adjustment window.
• Fortune Bet: Toggles Fortune Bet mode on/off.
• Settings: Access game settings and information.
• Game History: Shows play history.
• Sound: Enables or disables game sound.

Keyboard Controls

• The SPACE BAR can be used as an alternative for pressing the primary on-screen button.

General Information

• Game recovery restores to the last state after interruptions.
• Minimum stake: £0.10 per game.
• Maximum stake: £5.00 per game.
• The RTP is shown in-game.
• Any single game potential win is limited to £50,000 (excluding jackpots).
• The game outcome is pre-determined; player choices do not affect the result unless indicated.
• Malfunction voids all pays and plays.

Big Bonus Booster Demo Mode & Free Play Overview

Many players look for a Big Bonus Booster free play or Big Bonus Booster demo mode to get a feel for the slot before staking money. Although this website does not host playable demos or free versions of the game, this guide is here to provide a clear breakdown of what you can expect.

On this page, you’ll find an outline of the gameplay style, core mechanics, and standout features that make Big Bonus Booster unique. We cover the essentials such as special symbols, bonus triggers, and any distinctive elements that shape how the slot unfolds.

By reviewing this information, you can gain an accurate sense of the slot’s style and flow without needing direct access to a demo. Think of it as a preview that highlights how Big Bonus Booster works, giving you the knowledge you need before trying it out for real-money play.

*All values (Bet Levels, Maximum Wins etc.) mentioned in relation to this slot game are subject to change at any time. Game features mentioned may not be available in some jurisdictions.