Nuclear Tumble

Relax Gaming sets Nuclear Tumble in the aftermath of what looks like an atomic meltdown, with a muscular overalled bear wandering past oversized fruit and vegetables, crumbling buildings, and distant cooling towers leaking vapour into a hazy sky. The mood sits somewhere between post-apocalyptic and cartoonish, and that tone carries through into the bonus rounds, where glowing radioactive material lights up the grid.

The action plays out on a 6x6 board that can hold up to 25 stone blocks, generating 46,656 ways to win. Winning symbols are cleared along with any stone blocks sitting directly above, below, or beside them, and the remaining symbols tumble down to fill the gaps for a fresh chance at a win, repeating for as long as new combinations keep forming.

Card suits make up the low-paying symbols, worth 0.2x the stake for five of a kind, while blueberries, apples, aubergines, tomatoes, and the bear character sit at the top of the paytable at 0.3x to 1x for a five-symbol line. A radioactive wild can land on any reel except the leftmost and substitutes for every paying symbol. When a stone block is destroyed it can reveal a coin, an exploding bomb, or one of three scatter symbols; a bomb clears every non-cash symbol sharing its row and column once no further wins remain, while cash symbols pay out and vanish once they reach the bottom row, taking any stone block beneath them with them.

Clearing every stone block from the grid triggers Meltdown Mode, wiping the board except for cash symbols and running an extra tumble with better odds of landing larger cash values. Landing three or more scatters awards 6 free spins, and if a super or ultra scatter appears alongside them, that upgrades to 6 super free spins or 10 ultra free spins, with a gamble option offered before the round begins to push for the higher tier. Inside free spins, collecting four cash symbols raises the feature's progression level, increasing the cash values on offer and adding an extra spin; values run from 1x-5x at the lowest level up to 200x-2,500x once the feature reaches its highest tier. A Supercharge menu offers a run of separate buys, from boosted bonus odds and all-gold cash values through to outright free spins and golden free spins purchases at escalating stake multiples, plus an Enhanced Bet that doubles the wager to lift the chance of both Meltdown Mode and free spins.

Nuclear Tumble ships at 96% RTP, with a 94% configuration also available, runs medium-to-high volatility, and pays a maximum of 5,000x the stake from bets between 0.20 and 200 per spin. With tumbles restarting through Meltdown Mode and cash values escalating across four progression levels in the bonus round, the pace rarely settles once the reels start clearing.