176 million spins on stormborn: a 10-point RTP ladder, and the floor version added up to 18 points to the bust rate
exp · 079 · 2026-06-27 · simulation-based
Run it yourself in the live simulator. All figures are simulation-based observations, not predictions. See our methodology.
what we measured
| parameter | value |
|---|---|
| provider / engine | Hacksaw Gaming · feature spins, Norse theme |
| configs simulated | 96.27% (provider default) · 86.23% (published floor of the ladder) |
| published rtp ladder | 96.27% / 94.21% / 92.28% / 86.23%, a verified 10.04pp spread |
| volatility | high |
| stakes | $0.20 / $0.50 / $1.00 per spin |
| bankrolls | $50 / $100 / $200 |
| sessions | 10,000 per stake/bankroll cell, 90,000 per version |
| spin cap | 2,000 spins per session |
| max win | 15,000x stake (a feature event) |
| feature buys | 3x / 50x / 100x / 200x (non-UK) |
model inputs worth flagging: the four-step RTP ladder, the 15,000x max and the priced bonus buys are sourced. Hacksaw does not publish a hit frequency or bonus trigger rate, so both were modelled (about 25% hit, one feature every ~200 spins) as documented assumptions; the bonus payout distribution and base-versus-feature split are model assumptions calibrated to the published RTP and the 15,000x cap. the cross-version comparison holds all inputs constant, so it is robust; absolute bonus figures are estimates.
how long bankrolls survived
the stake sets the clock. at the $100 bankroll the default-version median ran 592 spins at $0.50. the base game keeps small wins coming, but the meaningful payouts wait behind the feature, and most sessions run dry before one lands.
bust rates
bust rates within the 2,000-spin cap, 96.27% default version, 95% confidence intervals:
| $50 bankroll | $100 | $200 | |
|---|---|---|---|
| $0.20/spin | 71.6% ±0.8 | 40.3% ±1.0 | 2.6% ±0.3 |
| $0.50/spin | 89.5% ±0.6 | 77.8% ±0.8 | 52.8% ±1.0 |
| $1.00/spin | 95.0% ±0.4 | 89.2% ±0.6 | 78.4% ±0.8 |
plain reading: hold the bankroll at $100 and move the stake from $0.20 to $0.50, and the bust rate nearly doubles from 40.3% to 77.8%. the only safe cell is $0.20 against $200 (2.6%).
the bonus wait, and what it pays
on our modelled trigger rate (about 1 in 200 spins, an assumption), the feature carries about 57% of the total return. the payout side (model-based estimates): the average feature paid 110x stake but the median was 60x, and 43% paid under 50x. the 15,000x ceiling is the rare tail; a typical feature pays around half the average.
what a finished session looks like
the final-bankroll distribution at $0.50/$100 has almost no middle. seven sessions in ten ended with under $0.50 of the original $100, busted, in effect, with the median finish near $0.46. then it leaps: the 90th percentile kept $323. the same die-or-detonate shape as the rest of our library.
the rtp version lottery
stormborn has one of the wider spreads we have measured: a published ladder from 96.27% down to 86.23%, a 10.04-point gap, and the casino picks the rung. we ran the full grid at the default and the floor; same model, same inputs, only the RTP changed:
| cell | 96.27% default | 86.23% floor | delta |
|---|---|---|---|
| $0.20/$100 bust | 40.3% ±1.0 | 58.1% ±1.0 | +17.8pp |
| $0.50/$100 bust | 77.8% ±0.8 | 86.4% ±0.7 | +8.6pp |
| $0.50/$200 bust | 52.8% ±1.0 | 69.3% ±0.9 | +16.5pp |
| $1.00/$200 bust | 78.4% ±0.8 | 86.6% ±0.7 | +8.2pp |
the floor version raised the bust rate by 8 to 18 points depending on the cell, because the spread is ten points wide. same game, same thunder. the only difference is the RTP the operator chose to run. the version is the one variable a player can actually pick, so play it where the published RTP is highest. our casino hub ranks operators by exactly that.
methodology note
we simulate models calibrated to published math, RTP, hit frequency, volatility profile, bonus behaviour, not the provider's game engine. results are sample-based observations from 176,385,171 simulated spins (180,000 sessions across two RTP versions), with 95% confidence intervals shown. hit frequency and bonus trigger rate are not published and were modelled as documented assumptions; the bonus payout distribution and base-versus-feature split are modelled. the base-game ceiling (400x) is a reasoned estimate; the 15,000x max is a feature event. casino-by-casino RTP figures are the published ladder, not statements about any operator's current configuration. model validation: stormborn v1, analytic calibration exact at 96.27% and 86.23%, 10M-spin checks within tolerance. slots are negative-expectation games; nothing here predicts outcomes or improves odds. corrections policy: methodology.html.
Where the max win actually comes from
57% of this game's RTP is locked inside the bonus you rarely trigger; the base game on its own returns just 41%.
A normal spin in our simulation never returned more than ~400x (€200). The 15,000x top win is a feature event, it only came out of the bonus. (base-game ceiling: model estimate)
Play the Stormborn demo, or stress-test it
Looking for the Stormborn demo or free play? A demo shows you a handful of spins. Our free simulator runs Stormborn across thousands of sessions and shows what actually happens to a bankroll over time: the bust rate, how long the money lasts, and the wait for the bonus. It is the demo with the math switched on.
FAQ
Is there a Stormborn demo or free play?
Yes. You can play Stormborn in demo mode at most casinos, and you can stress-test it free in our simulator, which runs thousands of sessions and reports the bust rate and session length, the demo with the math switched on.