Cosmic Heart

Review, Demo Play, Payout, Free Spins & Bonuses

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  • Different reel sets add to the excitement
  • Bonus game available
  • Free spins can be triggered
  • High volatility offers big-win potential
  • Complex maths model may put players off
  • Bonuses tricky to trigger

Cosmic Heart is an online slot created by High 5. It has an RTP of 96 per cent, high variance, and 20 paylines. Features include free spins, a bonus game, wilds, stacked wilds and multipliers.


Cosmic Heart takes us into the depths of the universe, where you will encounter clashing galaxies, coloured meteorites, celestial planets and a paying wild. There is a special prize line above the 5x4 reel set-up that offers different features, from free spins to expanding wilds and multipliers.

There are 20 paylines in Cosmic Heart, which pay from left to right. During the base game, the special feature symbol on the left of the row will disappear after each spin, as will any special feature that was activated during the win. All remaining symbols will move to the left and one or more new symbols will fill the vacated spaces to the right of the feature row.

The intersecting galaxy symbol appearing on the reels will trigger rewards related to the symbol in the prize line it appears below, exploding into a heart as it does so. There is also a pick bonus game that is entered when a ringed blue sapphire appears above the intersecting galaxies.

If you have enjoyed games from this developer in the past, you will find other High 5 slot titles here at Slots Temple. Alternatively, if cosmic games appeal, why not try Starburst slot? This is also available here at Slots Temple.

Theme, graphics and soundtrack

We are in deep space in Cosmic Heart, with the reels set against a psychedelic-coloured background. The symbols are brightly coloured stars and large planets suspended in space.

The graphics are simple but attractive and a haunting woodwind soundtrack plays during the game.
If you are interested in other games of this genre, you will find a number of space themed slot games here at Slots Temple - simply search by theme.

Cosmic Heart

Cosmic Heart RTP and variance

This slot has an RTP of 96 per cent and is high variance. Your bankroll can be reduced quite quickly; however, expanding wilds and other features can compensate to some extent when they are triggered.

How to play Cosmic Heart

Once the game loads, you are ready to play. Here are a few tips:

1. Click the + button in the top right-hand corner and then the i button to reveal the rules of the game and an explanation of all the features.

2. Return to the previous screen to adjust the volume.

3. On the main screen, click the autoplay button to set the number of autospins and your bet level. You can also customise the autospins to stop depending on the size of the loss or win, or when the bonus feature is entered.

4. Still on the main screen, you can adjust your bet per line - and hence your total bet - by clicking on the bet button to the bottom right of the screen.

5. Press the play button to set the reels spinning. Always remember to set yourself a budget for your session and to play responsibly.

Bet sizes and paytable wins

The bet range per line is 1 to 200 coins.

The prizes for matching symbols are as follows:

- Wild

5x = 200
4x = 40
3x = 20

- Ringed planet

5x= 100
4x = 30
3x= 15

- Yellow/blue planet

5x = 50
4x = 20
3x = 10

- Blue/pink/purple/green meteor

5x = 10
4x = 5
3x = 2

These values apply in both the base and the bonus games.

Cosmic Heart free spins and pick‘em bonus game

To generate the free spins bonus, you must land the cosmic heart below the pink ringed planet in the special features bar above the reels. You will win the number of free spins indicated in the heart.

The free spins operate on different reels but with the same bet per line and number of lines. Free spins can be won during this feature, which ends when you have used up your spins bonus or 100 free spins have been played.

You play with a different cosmic slider set of reels, beginning with a 1x multiplier. Pick green gems to reveal multipliers up to 10x. For each correct choice, the multiplier will increase by one for every seven gems chosen.

You will lose a life if you choose a stone that is hiding a black star. The game ends when all your lives are lost.

Our verdict

High 5 has brought us a game with high volatility and all the excitement you might expect from such a slot. The availability of free spins and a bonus game is a plus; however, the game may literally seem alien to many players, who may also be frustrated at how long they may have to wait for these added features. It can take some time to trigger the prize line features; what’s more, the expanding wilds can prove worthless as often as they create a winning line, especially the vertical expanders. Even so, you can expect some out-of-this-world payouts of up to 10,174x!

The bonus game is also hard to enter but again offers good prizes. You will need luck on your side to avoid the black holes hiding on the reels.

All in all, we are not too starry-eyed about the complex maths model behind this game.

Disclaimer: Cosmic Heart trademark / license is owned by High 5. This site is not endorsed by High 5.

* This button takes you to an external third-party partner real money casino website. Although we try and match games with Casinos that have them, we advise that you double-check the slot content on the casino website before making a deposit or signing up.

Slot Data
Slot Name: Cosmic Heart
Software: High 5
RTP: 96.00%
Volatility: High volatility
Paylines: 20
Reels: 5
Min Bet (all lines covered): £0.20 (GBP)
Max Bet: £20 (GBP)
Top Win: 10174
Features: Bonus Game , Wild Symbol , Scatter Symbol , Multiplier , Free Spins , 5 Reels , Stacked Symbols , High volatility
UK Available in GB? Game is not available in GB.


Is there a bonus game in Cosmic Heart?

Yes, Cosmic Heart has a lucrative pick’em bonus game of chance.

What is the RTP of Cosmic Heart?

The RTP is 96.0 per cent, which is bang-on the average.

Are free spins available?

Yes, free spins can be triggered in Cosmic Heart when you land the cosmic heart below the pink ringed planet in the special features bar above the reels.

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