Return
Cosmonanza slot is a 5×3, 20-payline video slot from Woohoo that blasts you into a neon galaxy. Medium-high volatility and a 96.48 % RTP deliver balanced risk, while stacked astronauts, expanding wilds and up to 20 re-triggerable free spins can rocket wins to 5 000× your stake. Bets run from 0.20 to 100.00 coins and the game is built in HTML5 for instant play on any device.
| Spec | Detail |
| 🎮 Provider | Woohoo |
| 🎲 Grid | 5 × 3 |
| 🛤️ Paylines | 20 fixed |
| 📊 RTP | 96.48 % |
| 🔥 Volatility | Medium-High |
| 🏆 Maximum Win | ×5 000 (theoretical) |
| 💰 Bet Range | 0.20 – 100.00 |
| 🎁 Core Features | Wild Substitutions, Scatter Free Spins, In-Round Multipliers |
| 📱 Platforms | iOS, Android, Windows, macOS |
| 🌐 Technology | HTML5 (instant play) |
The 96.48 % RTP is slightly above industry average. Medium-high volatility means you may see dry spells, but single spins can deliver large chunks of the 5 000× max win. Hit frequency is 28 %, free spins hit roughly every 145 spins, and the top line pay (5 Golden Astronauts) is 250× line bet.
A neon cosmos stretches behind translucent reels; shooting stars whiz by while an 80s synth soundtrack plays. Symbols are crisp illustrations rather than photos, keeping the file light for mobile. UI is minimal: bet slider on the left, spin on the right, paytable and rules one click away. Landscape or portrait mode automatically re-scales without cropping.
The Planet Wild appears on reels 2, 3 and 4 and expands to cover the entire reel when at least one substitution will create or improve a win. Expanded wilds pay the best possible combo on every line they touch.
Rocket Scatters land on any reel. 3, 4 or 5 award 8, 12 or 20 free spins plus an instant win of 2×, 10× or 50× total bet respectively.
During free spins a global ×2 multiplier is applied to every line win. Retriggering the feature raises the multiplier to ×3 for the remaining spins; a third retrigger pushes it to ×5, which is the ceiling.
Free spins use the same bet level as the triggering spin but a different reel strip with extra stacked Golden Astronauts. The round can be re-triggered indefinitely; the multiplier progression is kept until the feature ends.
| Symbol | Emoji | 3–5 of a kind (× line bet) | Function |
| Wild | 🪐 | See paytable | Substitutes for regular symbols on active lines; does not replace Scatters. |
| Scatter | 🚀 | See rules | 3+ trigger free spins; may pay independently if specified. |
| Golden Astronaut | 👨🚀✨ | See paytable | Top-tier premium; high return when paired with multipliers. |
| Silver Astronaut | 👩🚀 | See paytable | Premium symbol; strong line payer. |
| Space Helmet | 🪖🌌 | See paytable | Mid-value; frequent base-game contributor. |
| Neon Satellites | 📡💜 | See paytable | Low-to-mid; supports mixed-line outcomes. |
| Cosmic Ray Gun | 🔫🌠 | See paytable | Low-tier symbol; common line filler. |
| A / K | 🅰️ / 🇰 | See paytable | Low-value royals; frequent combinations. |
| Q / J / 10 | 🇶 / 🇯 / 🔟 | See paytable | Lowest-tier royals; most common line outcomes. |
Pros:
Cons:
5 000× your total bet, achievable during free spins with the ×5 multiplier and a full screen of Golden Astronauts.
Yes. Most Woohoo casinos host a demo version that uses fun credits with no registration required.
Real-money play unlocks actual cash wins, qualifies you for casino promotions, and gives access to the full multiplier ladder in free spins.
Land 3 or more Rocket Scatters. Alternatively, check the casino’s bonus page for slot-specific free-spin offers.
Absolutely. The game is built in HTML5 and runs natively in any modern mobile browser without app downloads.
The long-term theoretical return is 96.48 %, calculated over millions of spins.
