Nuclear Tumble: Meltdown on the Fallout Farm

Nuclear Tumble is a Relax Gaming video slot due for release on 29 October 2026, listed among Relax's own games. Relax describes it as set on a chaotic fallout farm, where a pumped-up grizzly grows oversized produce using nuclear waste.

The payout mechanic is Ways. The rules in Relax Gaming's demo describe a 6 column, 6 row grid with 46656 ways to win, paid for matching symbols on three or more adjacent reels starting from the leftmost reel.

Relax's own summary is short: tumbling payouts plus collection moments, with wins that cascade and coins that pile up. The detail sits in the game rules, which turn that into stone blocks, cash prize symbols, bombs and a mode called Meltdown.

Relax Gaming lists the minimum bet at €0.20 and the maximum bet at €200, the game type as Video Slot and the payout mechanic as Ways. The release date on its game listing is 29 October 2026.

The game page does not state an RTP, volatility, hit rate or max win, so none are quoted here. It does list alternative game IDs for other versions of the game, including a separate UK version and a German version, so check the RTP shown in the game's own rules once it is live.

Two prices are fixed in the demo's rules: Enhanced Bet is played at 2x the regular bet and Bonus Reels at 10x. Every other buy price is shown in the game itself.

Wins pay for matching symbols in any position on three or more adjacent reels from the left, and only the longest matching combination for each symbol is paid. Multiple matching symbols on a reel contribute to the winnings multiplicatively.

At the start of every spin there are up to 25 stone blocks on the reel area. When a win lands, the winning symbols are destroyed along with any stone blocks directly to their left, right, above or below. Remaining symbols drop, new ones fall in, and the process repeats until no more wins form.

Destroyed stone blocks can reveal a coin symbol, an exploding bomb or one of the three scatter symbols. Wild symbols appear on reels 2 to 6 and substitute for all regular paying symbols.

Cash prize symbols, the coins, are won when they reach the bottom of the game area, and they are removed from the game once that happens. On the way down, a cash prize symbol destroys any stone block directly underneath it.

Exploding bombs go off when there are no more winnings. A bomb destroys all non-cash prize symbols in the same row and column, leaving any coins in its path in place.

That gives each tumble sequence two jobs: forming wins that break stone blocks, and moving coins down to the bottom row where they pay.

Meltdown is triggered when every stone block has been removed and no further wins remain. It clears all symbols on the screen except cash prize symbols, and a new avalanche begins.

Relax's paytable describes the new grid as having an increased chance of more and bigger cash values. Stone blocks are what hide the coins, bombs and scatters, and clearing every one of them is what unlocks Meltdown.

A Meltdown bet mode is also listed, which triggers a spin that skips directly to the Meltdown feature, in regular and Golden versions, with the price shown in the game.

Free Spins are triggered by collecting 3 or more Scatters, which are collected as they appear on the game area. Normal Free Spins award 6 spins. If at least one Super Scatter appears with them, Super Free Spins award 8 spins and start at progression level 2. An Ultra Scatter triggers Ultra Free Spins with 10 spins and progression level 3, and if both appear, Ultra mode is triggered.

Before the round starts, there is an option to gamble the Free Spins up to a higher level, which can be repeated until Ultra is won or the gamble is lost. Gamble is not available for the Golden versions of the feature.

During Free Spins, every cash prize symbol collected adds to a progress meter. Collecting 4 awards an extra free spin and raises the possible coin values, and destroying a blocker that carries an extra free spin adds +1 spin.

The rules list three coin types whose values are multiples of the bet and grow with the progression level. Bronze Coins start at 1x, 2x, 3x and 5x at Level 0 and reach 7x, 10x, 15x and 20x at Level 4 and above.

Silver Coins range from 5x to 20x at Level 0 and from 30x to 100x at Level 4 and above. Gold Coins run from 20x to 100x at Level 0, 100x to 1,000x at Level 3, and 200x to 2,500x at Level 4 and above.

That table is why the free spins levels matter. The higher progression levels are what set Super and Ultra Free Spins apart from the Normal round, and each set of 4 coins collected raises the possible values again.

Enhanced Bet plays at 2x the regular bet with an increased chance of triggering Free Spins and Meltdown Mode. Bonus Reels plays at 10x the regular bet, removing all paying symbols so only Free Spin symbols and blanks can land, with an increased Free Spin entry chance.

The buy feature, available only in the base game, starts a Normal, Super or Ultra Free Spins session. Golden Spins remove the smaller cash prize values from the matching mode. Each option has its own theoretical RTP in the rules, and availability can differ by market.

The free Nuclear Tumble demo on this page is a pre-release build, so watch the mechanics rather than any single result. Count the stone blocks at the start of each spin and how many survive the tumble sequence, since clearing them all is what sets off Meltdown.

Follow the coins as well: they only pay once they reach the bottom row, and bombs and wins below them decide how far they fall. In Free Spins, note how often 4 coins are collected to push the level up.

A demo session shows how the rules behave, not what any future spin will pay. Play is for adults aged 18 and over only.

Other Relax Gaming titles covered on Slotscritic: Monkey Gods of the Inca, Cloudforge, Money Train 5 and Nugget Ridge.

When is the Nuclear Tumble release date?

Relax Gaming lists Nuclear Tumble's release date as 29 October 2026. It is one of Relax's own games, and a demo build is already playable. The game page lists a bet range of €0.20 to €200 and a Ways payout mechanic.

What is the RTP of Nuclear Tumble?

Relax Gaming does not state an RTP on the Nuclear Tumble game page. It does list alternative game IDs for other versions, including a UK version and a German version, so more than one version of the game exists. The figure for the version you play is shown in the game's own rules.

How do you trigger free spins in Nuclear Tumble?

Collect 3 Scatter symbols to trigger 6 Normal Free Spins. A Super Scatter alongside them gives 8 Super Free Spins at progression level 2, and an Ultra Scatter gives 10 Ultra Free Spins at level 3. Scatters can be revealed by destroying stone blocks, and a gamble can upgrade the level before the round starts.

What is Meltdown mode in Nuclear Tumble?

Meltdown triggers when every stone block on the grid has been removed and no further wins remain. It clears every symbol except the cash prize coins and starts a new avalanche, which Relax describes as having an increased chance of more and bigger cash values. A Meltdown bet mode skips straight to it.

Does Nuclear Tumble have a bonus buy?

Yes, the demo's rules list a buy feature for Normal, Super and Ultra Free Spins, Golden versions without the smaller coin values, a Meltdown bet, Enhanced Bet at 2x the regular bet and Bonus Reels at 10x. Prices for the buys are shown in the game, and availability can differ by market.

Can you play the Nuclear Tumble demo for free?

Yes. The Nuclear Tumble demo on this page runs Relax Gaming's game with play credits ahead of its 29 October 2026 release, so you can watch the stone blocks, cash prize coins, bombs and Meltdown mode without staking money. As a pre-release build, its rules are worth rechecking once the game launches.