149 million spins on blood suckers: the highest-RTP slot we have studied still busted 27% of $0.50/$100 sessions
exp · 061 · 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 | NetEnt · 5×3 line game, wild + scatter free spins |
| rtp simulated | 98.00% (the headline figure; lower operator versions are reported but single-source, not simulated) |
| volatility | low |
| hit frequency | 44.9% (~1 in 2.2 spins) |
| stakes | $0.20 / $0.50 / $1.00 per spin |
| bankrolls | $50 / $100 / $200 |
| sessions | 10,000 per stake/bankroll cell, 90,000 total |
| spin cap | 2,000 spins per session |
| max win | 1,014x stake |
a note on this study: we simulated only the 98% headline version. a lower-RTP ladder is reported for blood suckers but currently rests on a single source, so we have not simulated it, when a second source confirms the steps, we will add the version comparison. the bonus trigger rate is not provider-published, so we modelled it (about one free-spins round every ~80 spins) as a documented assumption; the bonus payout distribution and base-versus-feature split are model assumptions calibrated to the published RTP and the 1,014x cap. hit frequency (44.9%) and the 98% RTP are sourced.
how long bankrolls survived
this is what a high-RTP, low-volatility game does for survival time: at the $100 bankroll the median session ran the entire 2,000-spin cap at both $0.20 and $0.50, and even $1.00 sessions lasted far longer than on a volatile game. the 98% RTP and frequent small wins mean the bankroll erodes slowly rather than collapsing, you get a long, gentle ride. it is still a ride downhill on average.
bust rates
bust rates within the 2,000-spin cap, 95% confidence intervals:
| $50 bankroll | $100 | $200 | |
|---|---|---|---|
| $0.20/spin | 13.9% ±0.7 | 0.0% ±0.0 | 0.0% ±0.0 |
| $0.50/spin | 63.3% ±0.9 | 27.4% ±0.9 | 0.5% ±0.1 |
| $1.00/spin | 83.2% ±0.7 | 62.7% ±0.9 | 27.4% ±0.9 |
plain reading: at low stakes on a healthy bankroll, blood suckers is genuinely hard to bust, $0.20 against $100 or $200 busted essentially never within the cap. but the same fundamentals apply: raise the stake to $1.00/$100 and the majority still bust. high RTP buys you time and a soft landing; it does not flip the maths in your favour.
the bonus wait, and what it pays
on our modelled trigger rate (about 1 in 80 spins, an assumption), the free-spins round is frequent. the payout side (model-based estimates): the average bonus paid 18x stake and the median just 10x, with 93% paying under 50x. blood suckers spreads a high return across many tiny wins and small bonuses, the opposite of a bonus-buy slot, which is exactly why sessions last so long.
what a finished session looks like
uniquely in our library, blood suckers has a real middle. at $0.50/$100 the median session ended around $68 of the original $100, the 70th percentile kept $116, and the 90th kept $191, a genuine spread of survivable outcomes rather than the die-or-detonate shape of every high-volatility game we have studied. it is the clearest illustration we have of what RTP and volatility actually do: they shape the distribution of how you lose, not whether you lose.
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 148,798,391 simulated spins (90,000 sessions), with 95% confidence intervals shown. we simulated the 98% headline version only; a lower-RTP ladder is reported but single-source and not yet simulated. hit frequency (44.9%) is sourced; the bonus trigger frequency is not published and was modelled (~1 in 80) as a documented assumption; the bonus payout distribution and base-versus-feature split are modelled. the base-game ceiling (250x) is a reasoned estimate; max win 1,014x. model validation: blood-suckers v1, analytic calibration exact at 98.00%, 10M-spin check within tolerance. slots are negative-expectation games; nothing here predicts outcomes or improves odds, even at 98%. corrections policy: methodology.html.
Where the max win actually comes from
23% of this game's RTP is locked inside the bonus you rarely trigger; the base game on its own returns just 76%.
A normal spin in our simulation never returned more than ~130x (€65). The 1,014x top win is a feature event, it only came out of the bonus. (base-game ceiling: model estimate)
Play the Blood Suckers demo, or stress-test it
Looking for the Blood Suckers demo or free play? A demo shows you a handful of spins. Our free simulator runs Blood Suckers 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.
stress-test Blood Suckers free
FAQ
Is there a Blood Suckers demo or free play?
Yes. You can play Blood Suckers 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.