10 free spins on Book of Dead

New players only. Opt in required. Free spins credited on Book of Dead at £0.10 per spin. Winnings from free spins will be paid into a withdrawable cash balance. 3 day expiry. Players must enter a valid debit/credit card to claim this offer. 18+ BeGambleAware.org T&C's Apply

100% First Deposit Offer

New players only. 100% deposit match offer. Deposit £50 and wager 30x for £50 cash reward. 7 day expiry. Only cash stakes on slots will qualify. 18+ BeGambleAware.org T&C's Apply


Heartburst slot game is bursting with bonus features! With a Free Games Feature that can award up to 25 Free Games and Heart symbols that substitute for all other symbols except scattered Lucky 7 symbols. It’s all to play for in this traditional fruit game so what are you waiting for? Press the Spin button to begin!




Min Bet


Max Bet



Bonus: Free Games Feature, Substitute Symbol

Heartburst - Buttons

Total Bet

In Heartburst slot game, you can press the stack of coins button to adjust your desired bet amount that you wish to play with.


In Heartburst slot game, make sure your Total Bet is selected and once you’re happy, press the Spin button to begin.


In Heartburst slot game, you can press the Autoplay button to spin your reels automatically for a number of rounds you wish.

Heartburst - Bonus Features

Free Games Feature

In Heartburst slot game, if you find 3 or more Lucky 7 symbols, you will trigger the Free Games feature. This feature can also be triggered again during Free Games. Depending on the number of Lucky 7 Symbols you land will depend entirely on the number of Free Games you are awarded, such as the following:

3 Symbols - 15 Free Games 4 Symbols - 20 Free Games 5 Symbols - 25 Free Games

Substitute Symbol

In Heartburst slot game, make sure you keep a look out for the Heart symbols as they can appear on reels 1, 3 and 5 and substitute for all other symbols except the Lucky 7 symbols. But that’s not all, the Heart symbols expand to fill their reel before line wins are awarded. When one or more Heart symbols substitute, prizes are tripled. So stay alert on your reels!

Castle’s Verdict

Here at Castle Jackpot, we think that Heartburst slot game is a classic fruit game but with a galactic twist. With a Free Games Feature and a Substitute symbol, there is plenty of potential for players to win big so spin your reels in Heartburst slot game to begin. You can play on desktop, tablet or mobile as Heartburst is available on all 3 devices.