Thunderkick · 2026 · measured RTP 94.2% · tested 2026-11-03
Bjorn
A 94.2% RTP came out of Bjorn's 10,000-round EUR 1.00 demo test, and the bonuses that earned extra spins from 20 slain Draugar took 91.6% of all bonus money.
In numbers: the lab's RTP test on the official demo server measured 94.2% against 94.22% declared over 10,000 logged rounds; 25.4% of rounds paid; a natural bonus landed once per 200 rounds (50 in total) and a bonus round paid a median 16.8x the stake, mean 69.1x, trigger spin included; the biggest round paid 772.3x; the longest dry run was 24 spins.
Bjorn demo
United States·available at Cafe Casino
Same reels, real payouts
Cafe Casino runs the same Bjorn with the same math and adds a welcome bonus for players from the United States:
300% up to $2,000 + 150 FS 18+ · T&Cs apply · the demo stays free
Test card
10,000 spins · EUR 1.00 bet · every request logged
| Spins | 10,000 |
| Bet | EUR 1.00 |
| RTP declared | 94.22% |
| RTP measured | 94.21% (approximate 95% CI 72.1–116.4) |
| Hit frequency | 25% · every 3.94 |
| Dead streak max / avg | 24 / 3.91 |
| Median hit | 1.20x |
| Max win (no bonus round) | 152.4x · round 7219 |
| Free spins, natural | 50 · 5.0 bHz · every 200 spins · mean bonus round payout 69.1x stake |
| Balance start → end | 5,000 → 4,421 |
each run keeps its own spin log, CSV and raw server journal with checksums; the figures on this card combine all runs
Free spins on video
natural trigger · 50 in 10,000 spins
A natural trigger at a EUR 1.00 bet opens five free spins; global multipliers reach x11 and x16, the Draugr counter passes 20 for +2 FREE SPINS and an ability upgrade, and after seven spins TOTAL WIN counts up to EUR 37.20. Recorded in a separate browser session, outside the statistical samples.
Across the whole run the 50 natural bonuses split into 26 under 20x, 14 between 20x and 50x, 2 between 50x and 100x and 8 at 100x or more, and together they made up 37% of everything the game returned. The wait between two triggers ran from 3 to 748 spins. Payout figures here cover the whole bonus round in ordinary stakes, the trigger spin included: its scatter pays and line wins count towards the bonus.
Bjorn's rules call them retriggers, but every extension in the log came from the Draugr counter under the grid: two spins for every 20 Draugar defeated (a Troll counts as nine), handed out when a free spin finishes along with 1 to 3 Abilities or upgrades. The opening five spins are not counted. Across the 50 natural bonuses the counter made 34 awards and extended 26 rounds, 20 of them once, four twice and two three times.
- triggers 50 1 per 200 spins
- every 200 spins gaps 3 to 748
- mean 69.1x bonus round median 16.8x stake
- best 772.3x round 57
- spins per bonus 6.4 5 to 11 observed
- 01round 5711 spins772.3x
- 02round 416111 spins452.6x
- 03round 95349 spins360.4x
- 04round 1107 spins304.8x
Risk profile
how much bankroll this run needed
| 50 bets | bust at spin 5783 |
| 100 bets | bust at spin 5897 |
| 200 bets | bust at spin 6076 |
One run, one bet size. A different session can bust earlier or never; treat this as a measured example, not a rule.
How it plays
10 rules screens from the game
Bjorn plays on an 8x8 grid of runes and forest symbols. A cluster needs at least five identical symbols joined along rows or columns, and its pay grows with size up to 15+, where the yellow Fehu rune gives 5.00x the bet, the orange Wunjo rune 4.50x and the four low symbols, a stump, a rock, a pine and a bush, 2.00x. Paid symbols disappear and the remaining ones drop in an Avalanche that keeps going while new wins or features appear. A golden W acts as Wild for neighbouring regular symbols, never for Scatters or Draugr.
Bjorn himself stands on the grid as the Hero symbol. Once no winning cluster is left he hunts every Draugr on the board, destroying the symbols in his path, then stays where he stopped and counts as a Wild until he moves again; new symbols fall toward him and can enter from different sides. A Troll may also turn up before a sequence ends, clearing a 3x3 area as it walks.
Defeated Draugar and Trolls may drop Loot, collected at the end of the sequence and paid at 0.10, 0.20, 0.50 or 5.00 times the bet. They can also raise the Global Multiplier, which applies to cluster and Loot wins after they are calculated and resets with each new round or free spin.
Every hammer Scatter on screen gets one chance to start the Bonus Game when a spin sequence ends, so no fixed Scatter count is required. The bonus opens with 5 free spins and 1 to 3 random Abilities or upgrades, for example a better Loot chance with +1 to 2 or +2 to 3 multiplier per Draugr, and every 20 Draugar defeated inside it add two spins and another 1 to 3 random Abilities or upgrades, a Troll counting as nine. Build 1.1.24 carries a 94.22% RTP rating with a 5,000x top prize, its bet selector runs from EUR 0.10 to 100, and a BET+ switch beside the spin button opens paid options that the game configuration prices at 1.5x, 3.5x and 12x the bet, plus a Bonus Game entry at 150x; this test played none of them.
Cluster pays
Cascading reels
Wild symbol
Scatter symbol
Free spins
Multiplier
On narrow screens, swipe or use arrow keys to view all payouts.
Bet range EUR 0.10 – 100 per spin · payouts read from the game's paytable at bet EUR 1.00
Gallery
10 frames from the demo session
Verdict
Extra spins came from Draugr kills
Twenty-four of the 50 natural bonuses never filled the Draugr counter, played their five spins and stopped at a 6.95x median, with 21 of them under 10x the stake. The other 26 earned at least one award of two spins, 34 awards in all, and their whole rounds came to EUR 3,164.30 of the EUR 3,455.10 that bonuses paid, 91.6%. Spins 6 and later, which exist only through those awards, averaged EUR 27.65 of free spins money each against EUR 5.49 for spins 1 to 5.
Four bonuses reached nine spins and averaged 166.28x, and the two that ran to eleven, rounds 57 and 4161, paid 772.3x and 452.6x. Those six rounds alone made EUR 1,890.00, 20.1% of all the money the ordinary series returned, and round 57's eleventh spin paid EUR 438.10 by itself. Counter and money climb together partly because the same Draugr kills drop Loot and lift the multiplier: spins 1 to 5 of the extended bonuses already averaged EUR 8.43, against EUR 2.32 in the bonuses that stayed at five, so a long bonus is as much the sign of a busy board as the cause of its payout.
Natural triggers came once per 200 rounds on average and, counted with their trigger spins, made up 36.7% of what the ordinary series paid out, so ordinary spins supplied most of the return; the best of them, round 7219, reached 152.4x over a 10-step avalanche. The median bonus was worth 16.8x the stake, and all eight bonuses above 100x had been extended at least once.
- Round 57 stretched from 5 to 11 free spins and paid 772.3x, the top round of the series
- Spins earned through the Draugr counter averaged EUR 27.65 of free spins money each
- The 86 rounds where a Troll walked without starting a bonus averaged 17.74x the stake
- EUR 282.70 came from a single free spin, the ninth of round 4161
- No round without free spins went past 152.4x, the peak of round 7219
- After a 5.2x bonus on round 113, 747 rounds passed without a trigger
- Just 6 natural bonuses out of 50 ran longer than seven spins
Test record
10,000 rounds · 0 buys · open data · closed rig
One test run so far: a single session of the base game on the official demo server, every request and response logged; the game offers no bonus purchase, so every feature in the sample came from ordinary spins. When the game is tested again, the new run is added here and the figures on this page combine all runs into one sample.
- 10,000rounds logged
- 25%rounds that paid
- 772xbiggest round
- 1 / 200natural bonus rate
- 24longest dry streak
01run Run 012026-11-03 measured return94.21%0.0 pts vs declared
- 95% band
- 72.1–116.4%
- rounds that paid
- 25%
- biggest round
- 772x · round 57
- longest dry streak
- 24
- natural bonuses
- 50 · one per 200 rounds
- balance start → end
- 5,000 → 4,421
- deepest drawdown
- 1,907x
10,000 ordinary rounds, including naturally triggered features, at a fixed EUR 1 bet; recorded on the official Thunderkick demo server (jurisdiction DOTCOM, RTP profile 94.22%); every request and response logged; test run 2026-11-03.
The test rig plays the official demo build over the network and records every server round: bet, win, intermediate steps (cascades, respins), free spins, collect. Screenshots and video were captured in a separate browser session and are not part of the statistical samples. The text was read against the log by an editor before publication. How we test →
FAQ
8 questions · answered from the log
Can Bjorn free spins be extended after they start?
Yes. Every 20 defeated Draugar add two free spins and 1 to 3 random Abilities or upgrades when a free spin finishes, and a defeated Troll counts as nine. Over 50 natural bonuses the counter handed out 34 such awards, enough to stretch more than half of them past their opening five spins and two of them to eleven.
Is a Bjorn bonus that stays at five free spins worth much?
No. The 24 natural bonuses that ended after five spins had a 6.95x median, 21 of them paid under 10x the EUR 1.00 stake, and together they made EUR 290.80, 8.4% of the money bonuses paid. The three exceptions were rounds 879 at 96.7x, 5030 at 25.3x and 6971 at 20.3x.
Does Bjorn let you pay to enter the free spins?
Yes, through BET+ rather than a buy button. The game configuration of build 1.1.24 lists a Bonus Game entry at 150x the bet with a 94.10% RTP, next to BET+ options priced at 1.5x, 3.5x and 12x the bet. This test used none of them: all 10,000 rounds were EUR 1.00 base bets, and the free spins arrived naturally 50 times, on average once every 200 rounds.
After a Bjorn bonus, how many rounds until the next one?
On average 200, which at EUR 1.00 is EUR 200 of gross turnover, not a net price, because base wins pay part of it back. The spread was wide: round 113's bonus was followed by 747 rounds without a trigger until round 861, and four other gaps exceeded 500 rounds.
Bjorn says 94.22% RTP, so what did the demo actually return?
EUR 9,421.10 came back from EUR 10,000 staked over 10,000 ordinary rounds at EUR 1.00, a measured 94.21%. With an approximate 95% CI between 72.05% and 116.37%, the near match says little about the model by itself, and leaving out the best round, number 57, drops the series to 86.50%.
Bjorn's maximum win is 5,000x; how close did the test come?
Nowhere near it. Round 57 led the 10,000 rounds at EUR 772.30, 772.3x the stake, as a natural bonus that grew from 5 to 11 free spins and paid EUR 438.10 on its last spin alone, while round 7219, at 152.4x, led every round that had no free spins.
Is most of Bjorn's payout made in free spins?
No. Natural bonuses, trigger spins included, paid EUR 3,455.10, 36.67% of everything the 10,000 ordinary rounds returned, and the free spins alone made EUR 3,253.40. The whole bonus rounds averaged 69.10x the stake against a 16.8x median, because six long bonuses took 54.7% of the bonus money.
When a Troll walks across the Bjorn grid, what does it do?
It may appear before a spin sequence ends, clears symbols in a 3x3 area as it moves and counts as nine Draugar toward the counter. In the ordinary series a Troll showed up in 113 of 10,000 rounds, and the 86 of them that started no bonus averaged 17.74x the stake.
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- spins10,000
- bet1.00
- result-579x
- RTP measured94.2%
- bonuses50
- max win, no bonus152.4x
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