Nitropolis 4

9.0/10

Release February 2023· Updated June 2026

ELK Studios' top slot for max win, released February 2023. Avalanche grid expansion + 262,144 ways, 50,000x max win. BetsRank score: 9.0/10.

RTP

94%

Volatility

High

Max Win

50 000x

Grid

6x4 grid (expands to 8 rows)

Bonus Buy

Avalanche (grid expand +1 row par win)Nitro Reels (4-12 symboles)Big Nitro Reels (2x2 symboles)Nitro Multipliers x4-x128 Nitro Booster modifiersFree Spins 8-20 (3-6 scatters)Super Bonus persistent Max Rows + Both Ways

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BetsRank Verdict

Hands-on testing by Alexandre Dubois — bonus tested, multiple sessions

Released on 8 February 2023, Nitropolis 4 is ELK Studios' top slot for max win, at 50,000x. It uses a 6x4 grid that expands up to 8 rows, reaching up to 262,144 ways at maximum (4,096 ways at base). RTP sits at 94%, below the market average ⚠️, with high volatility. Signature mechanics: Avalanche with grid expansion of +1 row per win, Nitro Reels (4-12 symbols), Big Nitro Reels (2x2 symbols), Nitro Multipliers x4 to x12, and 8 random Nitro Booster modifiers (Both Ways wins / max grid height / etc.). Free Spins of 8-20 spins (3-6 scatters) with frozen Nitro Reels and expanding safety levels. Super Bonus with permanent Max Rows + Both Ways. No Bonus Buy.

Strengths

+50,000x max win — top of the ELK portfolio
+Grid expands from 6x4 up to 8 rows
+Up to 262,144 ways at maximum
+8 random Nitro Booster modifiers
+Super Bonus with persistent Max Rows

To consider

−94% RTP below the market average (96-97%)
−No Bonus Buy option
−Dense mechanics for newcomers
−Comic universe that feels overused

About Nitropolis 4

Released on 8 February 2023, Nitropolis 4 is ELK Studios' top slot for max win, at 50,000x. It runs on a 6x4 grid that expands up to 8 rows via the avalanche mechanic, reaching up to 262,144 ways at maximum (versus 4,096 ways at base). RTP sits at 94%, below the market average ⚠️, with high volatility. Signature mechanics: a classic Avalanche feature with the grid expanding +1 row per consecutive win, Nitro Reels (regular containers of 4-12 symbols), Big Nitro Reels (2x2-sized symbols), Nitro Multipliers x4 to x12 that stack, and 8 Nitro Booster modifiers that appear at random (Both Ways wins / permanent max grid height / symbol modifications / etc.). Free Spins of 8-20 spins are triggered by 3-6 scatters, with frozen Nitro Reels and safety levels that expand the grid. A Super Bonus variant (triggered by special symbols) activates permanent Max Rows + Both Ways. There is no Bonus Buy.