Return to player
96.2%
Minimum bet size
0.10
Game category
Video Slots
Volatility
High
Reels
6
Progressive jackpot
No
Popularity
Maximum bet size
100
Game provider
Thunderkick Gaming
Bonus features
Yes
Paylines
50
Theme
Battle
Second Thunder online slot game
Developed by Thunderkick, Second Thunder is a video slot set in a dark fantasy winter battlefield. Snow-covered ground, armoured knights and a conflict-focused presentation establish its bleak visual identity.
The game uses a high-volatility mathematical model and carries a stated maximum win potential of up to 12,500x the bet. It is aimed at players drawn to riskier slots with a strong theme, while this review examines how its features and mechanics shape the play experience.
Second Thunder Theme, Visual Style and Battle Mechanics
Second Thunder stands out visually, resembling a moving oil painting. Behind the 6x5 grid, heavily armoured knights advance away from the player with spears in hand as rain falls across the scene. The soundscape adds another layer of tension, reinforcing the stark atmosphere of the frozen, deserted battlefield.
The symbols use a sharp metallic treatment:
- Low-Paying Symbols: Worn helmets, halberds, horns and shields can pay up to 0.8x for a 6-of-a-kind hit.
- High-Paying Symbols: Mythic and predatory images, such as eagles, snakes, boars, wolves and Viking-style warriors, pay up to 10x for six matching symbols.
- Wild Symbol: The sparking thunderbolt substitutes for every symbol other than the Scatter.
*The payout chart below is calculated from a $1.00 bet.
| Symbol | 6x Match | 5x Match | 4x Match | 3x Match |
|---|---|---|---|---|
 | 10x | - | - | - |
 | 10x | 5x | 2x | 1x |
 | 2x | 1.5x | 1x | 0.5x |
 | 1.6x | 1.2x | 0.8x | 0.5x |
 | 1.5x | 1x | 0.8x | 0.4x |
 | 1.4x | 1x | 0.7x | 0.4x |
 | 0.8x | 0.6x | 0.4x | 0.2x |
 | 0.8x | 0.6x | 0.4x | 0.2x |
 | 0.6x | 0.5x | 0.3x | 0.1x |
 | 0.6x | 0.5x | 0.3x | 0.1x |
Top Casinos to Play Second Thunder:
Key Features: Wild Fields and the Strategic Feature Row
Two distinctive mechanics shape Second Thunder, capable of turning a quiet snowfall into a dramatic thunderstorm within seconds.
- Wild Field Feature: The game's signature feature begins when two or more Wilds land on separate reels. A rectangle then activates, changing every symbol inside its boundary into Wilds. Recorded checks found that large fields can create particularly forceful win sequences, although outcomes remain variable.
- Feature Row: This additional line sits above the main reels and may appear at random with Scatters, Wilds or multipliers of up to 10x. Its multipliers are additive rather than replacing one another, so their values combine to enhance a win on the reel immediately underneath.
Bonus Game: Using Persistent Multipliers
Landing 3 or more crackling Scatters anywhere on the reels starts the Bonus Game. It begins with 5 Free Spins, with + 2 additional spins awarded for every Scatter beyond the first three.
The Feature Row stays active on every spin during the bonus round, increasing the opportunity for Wild Fields and additive multipliers compared with the base game. The original review also highlights retriggers: landing 3 Scatters during the feature awards an extra 5 spins.
Second Thunder Feature Buy Options and Bet+ Strategy
The original review describes the base game as "predictable" and reports that its testing rounds made the Feature Buy (Bet+) options central to its suggested strategy. These purchases still carry the slot's high-volatility risk.
- Presence of Thor (15x bet): The review says this purchase guarantees an active Feature Row on the initial spin.
- Thunderstorm (15x bet): The review says this option guarantees a Wild Field on the initial spin.
- Direct Bonus Access (75x bet): Players who want to bypass the build-up can buy directly into the Bonus Game. It is a steep purchase, but places the player immediately in the slot's feature round.
In the testing, the Presence of Thor and Thunderstorm Feature Buys did not produce big wins unless they were used for more than 15 rounds. The review consequently characterises them as costly options with relatively low returns; that observation is not a guarantee of future results.
Direct Bonus Access, despite its very high price, was its most consistently reliable option and produced wins of up to 450x the base bet. Those reported results are attributed observations rather than a promise, and the cost makes the purchase mainly relevant to risk-taking high rollers.
Best Second Thunder Alternatives: Similar Slot Games to Try
- Gates of Olympus 1000 from Pragmatic Play is an expanded take on the popular Gates of Olympus slot. It uses the Pay Anywhere system, lists an RTP of 96.50%, and places Zeus at the centre of the theme. The review presents its increased volatility, higher RTP and triple maximum win potential as changes that build on the original game's format.
- Gates of Hades, also from Pragmatic Play, revisits Greek mythology with a different presentation. Its Cluster Pays mechanism, Free Spins and Wild Multipliers accompany high volatility and an RTP of up to 96.52%. The slot lists a maximum win of 10,000x the stake, making it another option for players interested in mythological themes.
Final Verdict: Does Second Thunder Suit High-Volatility Players?
Second Thunder pairs a dark, atmospheric setting with mechanics built around high volatility and several interacting features. Although its RTP is described as below the broader market average, the relationship between Wild Fields and the Feature Row can give the base game added momentum when features appear.
Rather than offering a light or casual theme, Second Thunder delivers a more intense and less predictable session. It is therefore best suited, according to the review's positioning, to players who value high volatility, layered feature interaction and larger win ceilings more than steady or frequent payouts.
With 12+ years of experience in the iGaming industry, Evan specializes in reviewing online casinos, analyzing slot games, and evaluating player safety. Their expertise covers casino licensing, RTP, volatility, bonus conditions, and withdrawal policies. Through hands-on testing and independent research, Evan delivers transparent, fact-based reviews to help players better understand gambling platforms, their features, and potential risks.
