Rogue Rats of Nitropolis

Elk Studios built Rogue Rats of Nitropolis as the second chapter in its Battle of Nitropolis series, putting the rodent faction at the center of the action. Rather than a fixed reel set, the game drops a rat character onto an open, scrolling map and lets it roam in search of value, trading the studio's usual Nitro Reels and multi-way wins for a driving-and-collecting structure set in a desert far from the series' usual cityscape.

The rat pilots one of four differently coloured vehicles across the map and can only pick up pay symbols that share its vehicle's colour. Swapping into a new vehicle mid-round changes which symbols it can gather. The visible play area starts as a 5x5 section of a larger grid, and the rat's field of view can grow as the round continues, with whatever it can see determining which direction it drives next.

Each of the four pay symbol types has multiple payout tiers: the lowest pays between 0.05x and 0.2x the stake, climbing to a top tier worth 1x to 5x once upgraded. The rat scoops up symbols sitting next to it horizontally or vertically, and running into a cluster of matching or mismatched colours can force a change of direction. Coins bearing bet multipliers can also be picked up alongside the standard pay symbols.

Every round begins with a random vehicle and a starting fuel supply that drains with each move; collecting pay symbols or interacting with feature symbols tops it back up. Filling the fuel gauge triggers a temporary Nitro Fuel Boost, giving the rat unlimited movement until its next coin pickup. A round ends once fuel runs dry and no further collection or bonus is available.

Several feature symbols are scattered across the map. Shooting a Nitro Blob upgrades any pay symbols in view to a higher tier. A New Vehicle symbol lets the rat swap colours outright. Nitro Wells and Fuel Depots refill the tank directly, destroying vehicle targets yields coins, and a Police HQ symbol along with a dedicated Max Win coin can also turn up. Shooting a Missile Silo widens the rat's visible area, and driving onto a Turret extends its reach further out. Tied into this is the Nitro Multiplier, applied to coin wins and symbol collections once switched on; shooting the radar-style symbol turns it on or bumps it to a higher locked value.

Picking up two scatter symbols awards three free spins, and if one of those scatters is a super version, each spin opens with its own Nitro Fuel Boost already running. The round can retrigger, and a regular bonus can upgrade into its super form mid-way through; whatever payout tier and multiplier were active beforehand carry over.

A bonus-buy menu offers five paid entry points: a 3x-stake option starting the round with one bonus scatter already banked, a 10x-stake spin with extra visibility and double starting fuel, a 25x-stake spin swapping pay symbols for more frequent coins, a 100x-stake purchase of the regular free spin round, and a 500x-stake buy straight into the super bonus.

Mathematically, Rogue Rats of Nitropolis returns 94% regardless of entry method, paired with high volatility and a maximum win of 25,000x the stake. Stakes run from 0.20 up to 100 per round.