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For thousands of years we have been fascinated by the sky above us; the stars, planets and galaxies have left us spellbound. The game designers at Merkur make good use of this space theme by selecting a dramatic night sky, speckled with twinkling stars, shooting comets and other space-themed objects, as the background to their free online slot game Planets. Snippets of a hauntingly suitable classical music piece accompany each spin of the reels and add a final touch to what is a beautifully designed and well-thought-out online slot.
Step into the universe
You don’t need to be an expert on astronomy to enjoy the well-designed visuals featured in this game, but you may want some explanations of the more unusual symbols on the reels. The blue and green planet Earth is easy to pick out, as are red-hued Venus, Saturn with its spectacular rings, the imposingly large Jupiter and the fiery figure of Mars. The final regular icon is a swirling blue galaxy, which is also the Wild.
Rather than the usual supporting images of ace, king, queen and jack from a pack of cards, Merkur's Planets opts for a more-fitting set of symbols. Choosing to use images that are often only easily recognised by academics and serious astrology and astronomy enthusiasts is a bit of a gamble, but the game maker’s choice does fit in well with the theme, and so the risk certainly pays off. Neptune is represented by the pale blue trident symbol, the gold E lookalike is for Pluto, the pink circle with an arrow emerging from the top is used for Uranus, and the light green circle with the downward arrow represents Mercury.
Banking the cash
Acting as a Wild, the blue galaxy symbol substitutes for all other symbols, and can help to boost your winnings considerably. The blue galaxy is also the most generous of all the symbols featured, with five across the reels paying 80 coins. Second in the league is Earth, which offers 10 as a reward for a full house. The four other planets and the other unusual symbols only pay 3–4 for the same. It’s also worth noting that although the winnings for 2 or 3 matches are fairly low across the board they can be boosted with higher stakes or by adding extra paylines.
Extra options
There are two ways to boost your winnings in Planets. One is with the Wild icon. The other is triggered by any win, no matter how small, when players can choose between gambling all or half of the win on a 50-50 ‘guess the next playing card colour’ game, where success means doubling the stake, and a prize ladder option that could lead players either upwards to a bonus cash reward or down onto the loss rungs.
Planets is a fascinating free slots game with attractive features and it has been designed to provide the same high level of play to mobile and tablet users as it does to those playing on a larger screen.
Disclaimer: Planets trademark / license is owned by Merkur Gaming. This site is not endorsed by Merkur Gaming.
* Although we try and match games with Casinos that have them, we advise that you double-check the slot content on the casino before making a deposit.

Slot Name: | Planets |
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Software: | Merkur Gaming |
RTP: | 96% |
Volatility: | Medium volatility |
Paylines: | 5 |
Reels: | 5 |
Min Bet (all lines covered): | £0.05 (GBP) |
Max Bet: | £10 (GBP) |
Top Win: | 80 |
Features: | Medium volatility , Wild Symbol , Gamble |
Themes: | Space , Futuristic |
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Yes. Merkur Gaming have a UKGC license and are allowed to offer their games at UK licensed casinos. |
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Slot Name: | Planets |
---|---|
Software: | Merkur Gaming |
RTP: | 96% |
Volatility: | Medium volatility |
Paylines: | 5 |
Reels: | 5 |
Min Bet (all lines covered): | £0.05 (GBP) |
Max Bet: | £10 (GBP) |
Top Win: | 80 |
Features: | Medium volatility , Wild Symbol , Gamble |
Themes: | Space , Futuristic |
![]() |
Yes. Merkur Gaming have a UKGC license and are allowed to offer their games at UK licensed casinos. |