Drawing 4 Bonus symbols of any type on the highlighted central reels activates the Hold the Jackpot™ Bonus Game.
There are no regular symbols in the base game and Bonus symbols pay only in the Bonus Game or with the Moving Cash Out™ feature.
The maximum potential win amount is 1500x bet.
Special Features
STICKY TO INFINITY™
Mystery and Jackpot Mystery symbols with the Sticky to Infinity™ feature may randomly appear in the base game and stick to the reels until the end of the Hold the Jackpot™ Bonus Game.
All Sticky to Infinity™ symbols are locked in place while other symbols are spun.
If the Sticky to Infinity™ symbol is drawn on the highlighted central reels, it increases the chances of activating the Hold the Jackpot™ Bonus Game.
Sticky to Infinity™ symbols are temporarily removed from the reels when changing bet levels and Volatility Level™ and only appear on the bet level and Volatility Level™ they were obtained on.
CASH INFINITY™
Cash Infinity™ symbols may randomly appear in the base game and stick to the reels until the end of the Hold the Jackpot™ Bonus Game.
All sticky Cash Infinity™ symbols are locked in place while other symbols are spun.
When a Sticky symbol appears, the outcome of remaining non-sticky symbols is entirely random.
Cash Infinity™ symbols award prizes ranging from 5x-15x player’s bet. However, the prize will be paid at the end of the Bonus Game.
If the Cash Infinity™ symbol is drawn on the highlighted central reels, it increases the chances of activating the Hold the Jackpot™ Bonus Game.
Cash Infinity™ symbols are temporarily removed from the reels when changing bet levels and Volatility Level™ and only appear on the bet level and Volatility Level™ they were obtained on.
MOVING CASH OUT™
Moving Cash Out™ symbol can appear on a random reel except highlighted central reels and will stick to it from 5 to 15 spins before it becomes active.
When the countdown reaches 0, the symbol transforms into an active Moving Cash Out™ label for 5 to 15 spins.
If Cash, Cash Infinity™, MINI, MINOR or MAJOR Jackpot symbols are drawn on the reel with the active Moving Cash Out™ label, their value is accumulated.
With each spin, the active Moving Cash Out™ label moves down avoiding the Sticky to Infinity™ symbols. Once it reaches the bottom edge it moves to the top reel.
When the Moving Cash Out™ label countdown reaches 0, a percentage ranging from 10% to 100%, 150%, 200% or 300% is randomly drawn. The percentage of the sum of Bonus symbols’ values is then paid out.
Moving Cash Out™ symbols are temporarily removed from the reels when changing bet levels and Volatility Level™ and only appear on the bet level and Volatility Level™ they were obtained on.
HOLD THE JACKPOT™ BONUS GAME
All Bonus symbols stick to the reels during the Bonus Game.
3 Respins are granted at the beginning of the Bonus Game.
Each new Bonus symbol resets the number of Respins to 3.
The Bonus Game continues until Respins are finished, or all reels are filled with Bonus symbols.
Cash symbols award prizes ranging from 1x-10x player’s bet.
MINI, MINOR and MAJOR Jackpot symbols may randomly appear during the Bonus Game and award corresponding Jackpots. Multiple Jackpots of the same type may be won during the Bonus Game.
Collector symbol accumulates all values from Cash and Cash Infinity™ symbols and multiplies them randomly by 1-20x.
Mystery symbol can transform into any other Bonus symbol, apart from Cash Infinity™ symbols.
Jackpot Mystery symbol can only transform into MINI, MINOR and MAJOR Jackpot symbols.
Mystery and Jackpot Mystery symbols open one by one at the end of the Bonus Game.
When the Bonus Game ends, the prize is paid for the sum of Bonus symbol values, including MINI, MINOR and MAJOR Jackpots, unless the GRAND Jackpot is won.
Bonus symbols pay only at the end of the Bonus Game.
Collecting all 24 Bonus symbols of any type awards the GRAND Jackpot of 1500x player’s bet.
The GRAND Jackpot is the maximum prize in the game and Bonus symbol values are not added to it.
Hold the Jackpot™ Bonus Game is played at the same bet level and Volatility Level™ as the spin that activated the bonus.
CHANCE LEVEL™
The game is played with the base bet set by default.
However, the Chance Level™ feature can be enabled during the base game and you can select one of 3 levels:
Chance Level™ x2 – the base bet is multiplied by 2, giving you a 2x higher chance of activating the Hold the Jackpot™ Bonus Game.
Chance Level™ x5 – the base bet is multiplied by 5, giving you a 6x higher chance of activating the Hold the Jackpot™ Bonus Game.
Chance Level™ x10 – the base bet is multiplied by 10, giving you a 12x higher chance of activating the Hold the Jackpot™ Bonus Game.
The Chance Level™ feature does not affect the paytable, thus symbol values remain the same as for the base bet in both the base game and the Bonus Game.
Sticky symbols are temporarily removed from the reels when changing Chance Level™ and only appear on the Chance Level™ they were obtained on.
Malfunction voids all pays and plays.
The RTP is shown in-game.
Main Game
Play Button
Click to start playing at the current bet level.
Autoplay Settings (if available)
Click to access the Autoplay settings menu:
Number of games: Select the amount of spins.
At any win: Stops Autoplay at any win.
If single win exceeds: Stops Autoplay if a single win exceeds the set amount.
If cash increases by: Stops Autoplay if the balance increases by the set amount.
If cash decreases by: Stops Autoplay if the balance decreases by the set amount.
You can change the bet value by:
Clicking one of the buttons with the bet value on them.
Clicking the last button sets the bet to max value.
Clicking the plus and minus buttons increases and decreases the bet by one level.
Click and hold the minus or plus buttons to set the bet value to min or max.
Active counters:
Win – Current win.
Total Bet – Current bet in cash.
Balance
Current account balance.
Gamble
Risk your win for a chance to double it.
To Credit
Claim your win without next spin.
Game Settings
Click to access the game settings and game information:
Full screen mode: Click to switch Full screen mode on or off.
Use space key: Use space key as a spin button.
Energy Saving Mode: Use Energy Saving Mode to conserve battery.
Game History: Click to view your latest game history.
Advanced / unique gambling: Click to select the standard risk mechanism.
Standard / card gambling: Click to select a quick risk mechanism.
Sound Settings
Click to access the sound settings:
Mute: Click to mute all sound effects and music.
Sound volume: Click to switch sounds on or off.
Music volume: Click to switch music on or off.
Game Rules
Click to view game rules.
Paytable
Click to view winning combinations and payouts.
Game History
Click to view your latest game history.
The game history is available only when playing for money.
Close full screen
Click to close full screen.
Gamble Feature
The Gamble feature gives a chance to double each win.
The Gamble feature can be activated only with the current win value during the ongoing game session.
After activating the gamble feature, a player can:
take the win and end the gamble feature,
continue playing the gamble feature by selecting one of the two symbols.
After selecting a symbol, a draw is made to determine the winning symbol.
Each draw is independent of the previous one and has the same probability of winning.
The player can end the gamble feature after each round.
In the event of a loss, the player loses the win value specified in the current win counter and returns to the main game.
The Gamble feature can be played for a total of 7 rounds.
The number of rounds in the Gamble feature depends on the max win available in the game.
The win value from doubling up in the next round cannot be higher than GBP 7,500.
Current win – amount of win that can be taken.
Double to – win amount after a correct guess.
Additional Information
The following game features and settings may be subject to the terms and conditions of the gaming site. For more information on the following, refer to the gaming website:
The procedures used to manage unfinished game rounds.
The time after which inactive game sessions automatically end.
In the event of malfunction of the gaming hardware/software, all affected game bets and payouts are rendered void and all affected bets refunded.
Games that do not feature interrupted rounds are either rolled back with bet being refunded or are completed by awarding a win. Games that feature interrupted rounds and are not complete will last for 90 days.
Disclaimer: Some features and settings may not be available in your jurisdiction.
Cash Grotto Demo Mode & Free Play Guide
When players explore a new slot, many look for a Cash Grotto demo mode or Cash Grotto free play feature to understand the basics. While no demo version is offered directly here, this page acts as a reliable alternative. We’ve gathered the key details from the slot itself so that you can gain the same insight you would from free play, but in a clear, easy-to-read format.
Play This Game For Real Money Online
We've checked the availability & listed the top casinos with this game below:
Red Casino - 100% Up To £25 + 50 Extra Spins Welcome Package
18+. New players only. Min deposit £20. Max bonus 100% up to £25 on 1st deposit. 50 spins on specific game only on 2nd deposit. 35x wagering applies, within 21 days. Max wins from spins £100. Spins expire after 24 hours. Full T&Cs apply.
666 Casino - Up To £66 + 66 Free Spins For New Players
18+. New players only. Min deposit £20. Max bonus 100% up to £66 on 1st deposit. 66 spins on Big Bass Bonanza on 2nd deposit. 35x wagering applies, within 21 days. Max wins from spins £100. Spins expire after 24 hours.
18+. New Players Only. Welcome Package split over 2 deposits. Min 1st Deposit: £20 with 100% match up to £77. Min 2nd Deposit £20 with 77 Spins on Big Bass Bonanza. Wagering Requirement: 35x. Spins expire after 24 hours. T&Cs apply.
Red Casino is a brand new online casino site launched in 2023 & it offers a fantastic selection of online slots, live casino games & traditional casino games like blackjack & roulette. All of the games are real money games & in total, there are well over 1,000 slot games in their collection. Their game collection is also regularly updated & features big-name games like Fluffy Favourites, Big Bass Bonanza & more.
18+. New players only. Min deposit £20. Max bonus 100% up to £25 on 1st deposit. 50 spins on specific game only on 2nd deposit. 35x wagering applies, within 21 days. Max wins from spins £100. Spins expire after 24 hours. Full T&Cs apply.
666 Casino is an online casino that boasts over 1,500 real money games, including over 60 jackpot slot games, blackjack, roulette and live casino games. It's hugely popular in the UK & was re-launched in 2023 with a bigger selection of games than ever before. This particular casino site is lightning-fast & fully mobile-friendly. It also accepts PayPal deposits.
18+. New players only. Min deposit £20. Max bonus 100% up to £66 on 1st deposit. 66 spins on Big Bass Bonanza on 2nd deposit. 35x wagering applies, within 21 days. Max wins from spins £100. Spins expire after 24 hours.
Mr Luck Casino is part of the Aspire Global network, bringing players a selection of slots, table games, and live casino options. Fully licensed by the UKGC, it ensures a secure and fair gaming environment. New players can claim a 100% bonus up to £77 plus 77 extra spins on Big Bass Bonanza. The site hosts games from leading providers and supports various payment methods for easy deposits and withdrawals.
18+. New Players Only. Welcome Package split over 2 deposits. Min 1st Deposit: £20 with 100% match up to £77. Min 2nd Deposit £20 with 77 Spins on Big Bass Bonanza. Wagering Requirement: 35x. Spins expire after 24 hours. T&Cs apply.
Affiliate Disclosure
Some of the links on this page may be affiliate links, meaning if you click via our links to visit a casino and make a deposit, we may receive a commission at no additional cost to you. This does not affect the bonus offer or the quality of the information we provide on our site. We take pride in making sure we write unbiased reviews and always strive to provide you with accurate information. You can read our full review policy here.
Player Reviews
Please be aware that content published by visitors in comments or reviews is not checked for accuracy & the views expressed by commenters or reviewers do not necessarily reflect the views of BestCasinoHQ.
There are no reviews yet. Be the first one to write one.
Leave a Review
About BestCasinoHQ: Established in 2022, BestCasinoHQ is dedicated to delivering comprehensive reviews of online casino websites, highlighting the best in online slots, bingo, and casino gaming. With a wealth of expertise from working within the casino industry, our team is committed to helping you discover the finest online casinos and exclusive free spins no deposit offers. Enquiries? Contact us at: team [@] bestcasinohq.com.
DISCLAIMER - All promotional codes or free bet offers, welcome bonuses and promotions that are listed on this site are subject to the terms and conditions of the respective operators.
Gambling Can Be Addictive. Please Play Responsibly.
BestCasinoHQ is operated by Fortuna Gaming Limited. 14 Blandford Square, Newcastle upon Tyne NE1 4HZ.