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Nitropolis (ELK Studios) – Review & Demo Play
Best Nitropolis Casinos
Nitropolis from ELK Studios play free demo version ▶ Casino Slot Review Nitropolis ✔ Return (RTP) of online slots on December 2025 and play for real money✔
Nitropolis: Slot Overview
I’ve spent a lot of hours in Nitropolis, a 6-reel, 4,096 win way slot set in a grimy, industrial city run by four animal clans. The post-apocalyptic vibe lands straight away, backed by a soundtrack that swings from Britpop-style electronica to punk once the bonus starts. It’s a busy, eccentric mix that works. On mobile or desktop, the grid can swell with modifiers and the pace rarely lets up. It didn’t feel like a typical ELK outing, which I liked.
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Symbols in Nitropolis
Twelve regular symbols make the paytable, split into low, medium, and high pays. Wins land from the first reel across, three to six symbols long. Because win ways can explode, single line values are dialled down. Six mid pays are worth 0.24x to 0.36x for six of a kind, while six high pays go from 0.6x to 1x the stake. Faces from Dirty Dawgs, Gritty Kitties, Pug Thugs, and Rogue Rats headline the highs, with royals covering the lows.
A mushroom cloud wild steps in for anything except the bonus symbol. During free spins, that wild also counts for the scatter symbol when a scatter win is paid. Before the feature starts, one symbol is picked to be the scatter paying symbol, which helps the small line pays punch above their weight. The way the clans, wilds, and scatter pays interlock keeps the screen stacked with combinations, even when the individual figures on the paytable look modest.
Nitropolis Symbols and Paytable
| Symbol | Quantity | Payout |
|---|---|---|
| 6 | x5 |
| 5 | x2.5 | |
| 4 | x2 | |
| 3 | x1.5 | |
| 6 | x3.6 |
| 5 | x1.8 | |
| 4 | x1.4 | |
| 3 | x1.2 | |
| 6 | x3.4 |
| 5 | x1.7 | |
| 4 | x1.2 | |
| 3 | x1 | |
| 6 | x3 |
| 5 | x1.5 | |
| 4 | x1 | |
| 3 | x0.8 | |
| 6 | x1.6 |
| 5 | x0.8 | |
| 4 | x0.6 | |
| 3 | x0.5 | |
| 6 | x1.6 |
| 5 | x0.8 | |
| 4 | x0.6 | |
| 3 | x0.5 | |
| 6 | x1.2 |
| 5 | x0.6 | |
| 4 | x0.4 | |
| 3 | x0.3 | |
| 6 | x1.2 |
| 5 | x0.6 | |
| 4 | x0.4 | |
| 3 | x0.3 | |
| 6 | x0.5 |
| 5 | x0.3 | |
| 4 | x0.2 | |
| 3 | x0.1 | |
| 6 | x0.5 |
| 5 | x0.3 | |
| 4 | x0.2 | |
| 3 | x0.1 | |
| 6 | x0.5 |
| 5 | x0.3 | |
| 4 | x0.2 | |
| 3 | x0.1 | |
| 6 | x0.5 |
| 5 | x0.3 | |
| 4 | x0.2 | |
| 3 | x0.1 | |
|
Wild | |
|
Scatter | |
Nitropolis: Slot Features
Winning Respins fire after every win in the base game and the bonus. Only the symbols involved in the winning combination spin again, and if fresh wins appear, the respins keep rolling. It sounds simple, yet in practice it strings together some surprisingly long sequences. With multiple stacks in play and reels changing size, these respins are the glue that ties everything together, nudging the grid into new shapes until nothing fresh lands.
Nitro Reels are the star. They land covering two positions and can hold 4, 6, 8, 10, or 12 symbols, blowing up the number of ways in an instant. From the default 4,096, I’ve seen the counter leap towards silly territory, up to a theoretical 85,155,840 ways. Nitro Reels can also upgrade the win ways between respins and free spins, and when a spin misses, they may roll again for a second chance, which keeps the tempo high.
The bonus game triggers with 3, 4, 5, or 6 scatters for 10, 15, 20, or 25 free spins, and landing three or more again retriggers. Before it starts a paying symbol is chosen for scatter pays, so hitting it on three or more different reels pays regardless of lines. The clincher is that Nitro Reels become sticky for the whole feature. Lock a few big ones early and the screen can snowball in a very satisfying way.
Nitropolis Slots Game Maximum Wins, RTP, & Volatility
Nitropolis runs a 96.1% RTP and a highly volatile model. The hit rate sits at 19.8%, so roughly a win every five spins, though the respin chains make it feel busier. Max win is 10,000 times the bet, with ways capable of reaching 85,155,840 when everything lines up. In UK lobbies I’ve played stakes of 20p to £5 per spin. The maths fits the feature set, and while dry spells happen, the peaks line up with sticky Nitro Reels in the free spins.
How to Play Nitropolis
I keep it simple. Set your stake, spin, and let the Winning Respins do their thing after each hit. Nitro Reels can drop at any time to swell the grid. Three to six bonus symbols land the bonus game with 10 to 25 free spins, and one symbol is picked for scatter pays. In the feature, Nitro Reels stay sticky until the end, which is where momentum builds. If you prefer, ELK’s betting strategies can automate stake changes.
Nitropolis: Slot Verdict
At first glance Nitropolis can look like a lot. If you walk into free spins before checking the rules, the scatter pays can seem odd. A few sessions fixed that. Once the rhythm of Winning Respins and Nitro Reels clicks, it becomes second nature, and the sound design gives it extra swagger. It’s not the slot I put on to unwind at 4 am, but when I want chaos with character, it scratches that itch.
Potential is solid at 10,000x, which feels right given how often you can get absurd ways. I’d have liked a touch more punch in the bonus at times, as the scatter paying approach doesn’t always raise the pulse on its own, but sticky Nitro Reels make up for it when they lock well. Overall, Nitropolis is well made, loud in the best way, and capable of long, entertaining bursts when the gangs decide to play nice.
Gallery of video and screenshots of the game
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Mark Rylance
Editor in Chief and Developer – AllSlotsOnline.Casino
Gambling is one of my main passions in life and I strive to help players find the best place to relax and get excited about gaming.
Last updated 01.12.2025 by Mark Rylance