12 Bolts of Thunder
12 Bolts of Thunder is a Thunderkick slot built around a thunder and hammer motif, played on a 5x4 grid with 20 fixed paylines. A Mjolnir symbol can set off a hammer-driven win feature that breaks apart the reels to produce payouts. Separately, a Bonus Game hands out a run of free spins, and landing retriggers during that round extends it further. Graphics and sound effects are built around a storm-like atmosphere.
RTP published by the studio / 12 Bolts of Thunder
96.15%
Scale starts at 95% · other versions not published
Figures: Thunderkick game page, checked October 6, 2026; each value is linked to its page in the game facts table. Artwork © Thunderkick; image file from the Slots-Info slot database, not supplied by the studio.
30,000×
Max win, × stake
1
RTP version published · others not published
Game facts
| Metric | Value |
|---|---|
| Studio | Thunderkick1 |
| RTP versions | 96.15%1 |
| Other RTP versions | Not published by the studio |
| Volatility | High1 |
| Max win | 30,000× stake1 |
| Bet range | Not published |
| Layout | 5 reels · 5 Paylines1 |
| Features | Hammer win feature, Bonus Game (Free Spins)1 |
| Bonus buy | Not published |
| Release date | Not published by the studio |
Numbers link each value to the page it comes from. “Not published” means the studio does not state it; we add it when it does and never estimate a spec. Figures from casino sites are not used.
RTP versions
Thunderkick publishes one RTP setting for 12 Bolts of Thunder: 96.15%. Other RTP versions are not published by the studio. Check the game’s help or paytable screen at your casino to see which version it runs.
| RTP version | House edge | Return per $100, long run | vs highest |
|---|---|---|---|
| 96.15% (highest) | 3.85% | $96.15 | — |
House edge = 100% minus RTP. RTP is a long-run average across all players, not a prediction for a session.
Features
- Hammer win feature
- Bonus Game (Free Spins)
High volatility Volatility is set by the studio and is the same at every casino — unlike RTP.
Where it’s available
Not confirmed. Availability in regulated North American markets is not confirmed yet.
Regulated markets only; availability varies by casino.
