Theme and atmosphere
An army marches through snow and black smoke toward the end of the world, a hammer-wielding Thor half-hidden in the sky behind the reels. Martial music tightens as spins go on, and triggering the bonus brings a voice line announcing that Ragnarök has arrived while the grid glows frosty blue.
Battle-worn helms, axes, horns, shields, birds, serpents, warthogs and wolves fill the paytable. Cinematically it aims high for a slot and mostly lands, though the apocalypse never feels as titanic as the setup promises. Anyone after the studio’s brighter side, Pink Elephants 2 Slot style, is in the wrong game.
How does the Second Thunder Slot Demo play?
Second Thunder is a 6-reel, 5-row slot with 50 fixed paylines. Bets run from 0.10 to 100 per spin. The maximum win is 12,500x stake, although one published figure lists 12,000x, so check the game’s info panel before planning around it.
Wins need three or more matching symbols on consecutive reels from the left, and six of a kind pays between 0.6x and 10x stake depending on the symbol. Six thunderbolt wilds sit at the top of that range at 10x. Modest pays, by design, which tells you where the money is meant to come from.
Across a couple of hundred demo spins the base game drags whenever the Wild Field and Feature Row stay quiet. Long dry stretches are the price of high volatility, and our slots resources explain how that trade works.
What do the Second Thunder bonus features do?
The thunderbolt wild substitutes for everything except scatters, arriving singly or in 2 to 3 high stacks when the Feature Row injects it. Two reels with wilds on them is all it takes to form the Wild Field, and the zone between those reels turns solid wild. It can expand to all six reels, and its presence can help bring the bonus in.
Above the grid, the Feature Row activates at random during the base game or on demand through a Bet+ purchase. When active it shows at least one wild or scatter and can attach a multiplier of x2 to x10 to a reel. Multipliers landing on the same reel are added rather than multiplied, so x5 and x3 becomes x8, and stacks of x15 to x20 on a single reel are possible.
Three scatters anywhere trigger the bonus game with five free spins, plus two more for every scatter beyond the third. Five sounds thin until you notice the Feature Row is active on every single spin of the round, guaranteeing wilds, scatters and multipliers throughout. Three or more scatters during the round award a full retrigger, which is how a short round becomes a long one. A wide Wild Field sitting under a stacked reel multiplier is the moment this game was built to produce.
Bet+ offers five paid routes: Bonus Boost at 1.5x stake doubles the trigger chance, Bonus Boost Plus at 3x makes it five times likelier, Presence of Thor at 15x guarantees an active Feature Row on the first spin, Thunderstorm at 15x guarantees a Wild Field on it, and 75x buys direct entry to the free spins. Thunderstorm is the one that best shows off the mechanic for the money.
How does Second Thunder compare?
Here is how it lines up against the closest games in our catalogue.
| Second Thunder | Stormborn Slot | Forging Wilds Slot | Cod of Thunder Dream Drop Slot |
|---|
| Why it’s here | The game reviewed here | Fixed Paylines, Norse and Vikings theme, 96.3% RTP | Fixed Paylines, noticeably swingier | Norse and Vikings |
| Mechanic | Fixed Paylines, Walking or sticky wilds, Bonus buy | Wild-Trigger Respins, Fixed Paylines, Collection meter | Wild-Trigger Respins, Fixed Paylines, Walking or sticky wilds | Jackpot, Ways to win, Cascades |
| Theme | Norse and Vikings | Norse and Vikings | Norse and Vikings | Norse and Vikings, Fishing |
| Format | 50 paylines, 6x5 | 14 paylines, 5x4 | 20 paylines, 5x3 | 1,024 ways, 5x4 |
| RTP | 94.2% | 96.3% | 96.5% | 94% |
| Max win | 12,000x | 15,000x | 10,000x | 7,500x |
| Volatility | 8/10 | 9/10 | 10/10 | 7/10 |
| Our score | 7.0 | 8.0 | 7.0 | 5.5 |
What are the best casinos for Second Thunder?
Thunderkick games turn up across plenty of licensed operators, so the choice comes down to the site rather than the slot. Our Thunderkick casinos page is the place to start comparing licensing, payment options and withdrawal speed.
⚠️ Worth Knowing: Second Thunder’s RTP sits below the roughly 96% industry average, and Thunderkick RTP configurations can differ between operators. Check the paytable of the version you load rather than assuming the figure quoted here applies everywhere.
Bonus terms matter more than usual on a game this swingy, since a long dry run on wagering requirements is a real risk. Compare offers on our casino bonuses hub before depositing.
Given how much of the win potential lives in the bonus round, free spins bonuses are worth checking for terms that allow high-variance titles.
Play the Second Thunder Slot Demo for free
Spinning the Second Thunder slot demo above costs nothing, needs no account and needs no deposit. Stakes work exactly as they do for cash, from 0.10 to 100, and the Bet+ purchases are available in demo credits too, which is the cheapest possible way to see what 75x actually buys you.
💡 Tip: Run each Bet+ option for 20 to 30 demo spins before deciding which one suits you. Comparing Thunderstorm and Presence of Thor at the same 15x cost tells you quickly whether you would rather chase Wild Fields or multipliers.
Done here? Our demo slots library holds the rest of the catalogue, and upcoming slots tracks what is next out of the gate.
Pros and cons
| ✅ Pros | ❌ Cons |
|---|
| Wild Field can convert all six reels | Below-average RTP |
| Additive reel multipliers, x15 to x20 possible | Flat base game between features |
| Feature Row active on every free spin | 75x free spins buy |
| Wide bet range, 0.10 to 100 | Theme underplayed against its own setup |
Verdict
- Wild Field plus a stacked reel multiplier is a genuinely strong headline mechanic, and it justifies the 12,500x ceiling
- Five base free spins rely heavily on the retrigger to become meaningful
- The Bet+ menu is unusually well judged, with Thunderstorm the pick at 15x
- Presentation is a cut above most Norse slots, even if it stops short of console-grade
Best for: high-variance players who want feature buys to shape the session.
Skip if: you want steady base-game action or will not play under 96% RTP.
Play only what you can afford to lose, and set a deposit limit before you switch from demo credits to cash.
In summary
In summary, Second Thunder is Thunderkick’s dark Norse slot on a 6x5 grid with 50 fixed paylines, 94.20% RTP, high volatility and a 12,500x max win. Its Wild Field converts every symbol between wilds on separate reels, and additive Feature Row multipliers of x2 to x10 amplify reel wins. Three scatters award five free spins with the Feature Row guaranteed on every spin. Bet+ buys run from 1.5x to 75x stake.
