Nitropolis 2

Nitropolis 2 is an ELK Studios slot released in April 2021, carrying the ways-to-win format of Nitropolis forward onto the same 6-reel, 4-row grid starting at 4,096 ways. The theoretical RTP settles slightly lower at 95.0%, volatility is high, and the win cap holds at 10,000x the bet, with Nitro Reels once again able to grow the total ways count, this time as high as 191,102,976.

Nitro Reels return with the same 4-to-12 symbol stacking from the original, and the Wild substitutes for anything except the scatter, paying as the highest-value symbol in any line it completes. The headline addition is a new Nitro Booster reel sitting above the grid, carrying 8 possible modifiers split into green, which affects a single column, and gold, which affects every reel at once: Nitro Wild, All Wild, All Premium, Nitro Upgrade, All Match, Respin, and Pay Both Ways among them, landing before a spin resolves and reshaping the grid in whichever way that modifier calls for.

Free Spins

Landing 3, 4, 5, or 6 hot rod scatters awards 10, 15, 20, or 25 free spins, and every Nitro Reel active on the triggering spin locks in place for the round, with further scatters able to retrigger it. Winning Respins carries over unchanged from the original, holding contributing symbols in place for an extra respin before the grid cascades again.

X-iter Bonus Buy

Five X-iter tiers let players buy directly into a specific outcome, running from a cheap guaranteed-win entry up to a 500x Super Bonus that guarantees 12 active Nitro Reels on the very first spin of the round, the maximum size every Nitro Reel can reach.

Nitropolis 2 Review

Nitropolis 2 keeps its predecessor’s core system nearly untouched and adds exactly one new layer, the Nitro Booster reel, but that single addition changes the rhythm of a session noticeably. Where the original’s Nitro Reels grew purely through free spins retriggers and lucky landings, the Booster reel now gives the base game its own source of sudden grid-wide changes, and the Pay Both Ways modifier in particular turns an ordinary spin into something closer to the bonus round’s payout shape without needing to trigger free spins at all. Dropping the RTP slightly to 95.0% against the original’s 96.1% is a small tradeoff for a game that otherwise offers a genuinely wider Nitro Reel ceiling, and the Super Bonus buy guaranteeing all 12 slots filled from spin one is the clearest way to see what the format looks like at its most extreme without grinding toward it naturally. It is also the entry that set the template every later Nitropolis game would keep returning to, a base grid paired with one dedicated modifier reel above it, even as the exact modifiers on offer kept changing from sequel to sequel and eventually spread across entirely separate spin-off titles built around a single gang each. Seen from that angle, Nitropolis 2 reads less like a cautious sequel and more like the game where ELK Studios worked out how far a single modifier reel could carry a follow-up before the format needed something structurally new, a question the third numbered entry would answer with a taller grid rather than another reel.