How to play Stardust Slots
Everything you need to enjoy the Cosmic Reactor — and a reminder that it is all free, with no real money and no real prizes.
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Set your launch cost
At the bottom of the reactor you will find the launch cost control. Tap – or + to choose how many Cosmic Credits each launch will use (10, 25, 50, or 100), or press Max to jump to the highest. Higher costs scale your potential rewards proportionally.
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Engage the reactor
Press the big Launch the reactor button — or just tap the L key. The three rings accelerate, blur, and then settle one by one into a 3 × 3 grid of glowing symbols.
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Align the symbols
If three matching symbols land along any active payline, the reactor lights up and returns Cosmic Credits to your balance based on the paytable below. That is the whole loop — relax and enjoy the show.
Understanding the five paylines
The reactor shows three rings, each displaying three symbols — a 3 × 3 grid. A payline is a path across that grid. Stardust Slots checks five of them on every launch:
- Top row — left to right
- Middle row — left to right
- Bottom row — left to right
- Diagonal — top-left to bottom-right
- Diagonal — bottom-left to top-right
If the same symbol appears three times along any of these lines, you have a stellar match. More than one line can light up at once, and their rewards add together.
Aim for the Supernova
The rarest symbol is the Supernova (✺). Three of them on a single line is the ultimate alignment, worth the top multiplier in the game. It is uncommon by design — that is what makes it special.
Symbols & paytable
Each reward multiplies your launch cost when three of a kind align on a payline. Remember: credits are virtual and have no real value.
| Symbol | Name | Three-of-a-kind | Rarity |
|---|---|---|---|
| ★ | Star | ×2 | Very common |
| 🪐 | Planet | ×3 | Common |
| 🌙 | Moon | ×4 | Common |
| 🚀 | Rocket | ×6 | Uncommon |
| ☄️ | Comet | ×10 | Uncommon |
| 👾 | Alien | ×20 | Rare |
| 🌌 | Galaxy | ×50 | Very rare |
| ✺ | Supernova | ×200 | Legendary |
Tips for enjoyable play
It is a game, not a goal
There is nothing to earn and nothing to lose here — credits are virtual. Play for the animation, the sound, and the fun of the alignment.
Recharge freely
Run low? Tap Recharge for a free top-up at any time. You never need to pay or wait.
Take breaks
The reactor will still be here later. Step away when you like — a short session is often the most fun.
Try the sound on
Our composer tuned every tone by hand. Tap the speaker icon to bring the reactor to life with audio.
Play FAQ
What happens when I run out of Cosmic Credits?
Nothing bad — just press Recharge for a free top-up. You can do this as many times as you like, forever.
Can I lose real money?
No. There is no way to spend, deposit, or withdraw real money in Stardust Slots. Every credit is virtual and has no value outside the game.
Does a higher launch cost improve my odds?
The odds of each symbol landing are the same regardless of cost. A higher launch cost only scales the size of the credit rewards, not the chance of a match.
Is my balance saved?
Your virtual balance is stored locally in your own browser, so it can persist between visits on the same device. Clearing your browser data resets it.