Relax Gaming · 2020 · tested 2026-09-12
Iron Bank
Newly sticky tens paid FUN 0.20 and then, revealed as Mystery queens, FUN 129.60 on the last of nine free spins in round 1597 of the Iron Bank demo.
- RTP measured / declared 97.0% 96.2%
- Hit frequency 29%
- Max win · no bonus 163x
- Bonus buy · mean result 100x · 0.86x
- Free spins, natural 25 / 10,000
- Bonus frequency 2.5 bHz
In numbers: measured RTP 97% against 96.2% declared over 10,000 logged rounds; 28.6% of rounds paid; a natural bonus landed once per 400 rounds (25 in total) and a bonus round paid a median 59.1x the stake, mean 126x, trigger spin included; 50 bonus buys at 100x returned 0.86x of their price on average, 76% of them below the price; the biggest round paid 861.6x; the longest dry run was 23 spins.
Test card
10,000 spins · FUN 2.00 bet · every request logged| Spins | 10,000 |
| Bet | FUN 2.00 |
| RTP declared | 96.20% |
| RTP measured | 96.95% (approximate 95% CI 73.9–120.0) |
| Hit frequency | 29% · every 3.5 |
| Dead streak max / avg | 23 / 3.49 |
| Median hit | 0.60x |
| Max win (no bonus round) | 162.6x · round 5559 |
| Free spins, natural | 25 · 2.5 bHz · every 400 spins · mean bonus round payout 126.0x stake |
| Balance start → end | 5,000 → 4,391 |
each run keeps its own spin log, CSV and raw server journal with checksums; the figures on this card combine all runs
Play Iron Bank demo
RELAX GAMING · official demo · same math as real play
United States
Iron Bank available at Cafe Casino
Same reels, real payouts
Cafe Casino runs the same Iron Bank 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
Bonus buy lab
50 buys × 100x · FUN 200 eachmean 0.86x · median 0.313× price (FUN 62.50) · 38 of 50 below price · best 8.10x · worst 0.00x
| Spins per bonus (avg / min–max) | 8.4 / 8–11 |
| Retriggered | 34% |
| Bonuses that paid nothing | 0% |
In the tested Mystery Symbol mode, completing a reel of sticky Mystery positions adds one spin. Seventeen of 50 purchases received extensions, adding 21 spins in total; other bonus modes were not sampled.
- Spent
- FUN 10,00050 × FUN 200
- Returned
- FUN 8,606.8086.07% · approximate 95% CI 44–128%
- Net
- −FUN 1,393.20−7.0 buys
- Break-even or better
- 12 / 5024%
- Paid 2× price or more
- 6 / 5012%
- Price in base spins
- 100natural trigger every ~400 spins
One ticket equals 100 ordinary stakes. Natural bonuses occurred once per 400 ordinary rounds in this sample. Stakes multiplied by this interval measure gross wagering, not the net cost of obtaining a bonus. Purchase returns above include the complete purchased round and are divided by the ticket price.
Risk profile
how much bankroll this run needed| 50 bets | bust at spin 75 |
| 100 bets | bust at spin 166 |
| 200 bets | bust at spin 494 |
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
16 rules screens from the game
Each Iron Bank spin uses a six-column grid with four positions per reel and 4,096 possible ways. A symbol pays once its longest run reaches three consecutive reels from the first column; extra copies within a column increase the number of combinations. Jaguar Wilds replace ordinary symbols on reels 2–6; Full Reel Wilds cover a whole reel between 2 and 5. The 2–10 factors on Full Reel Wilds multiply together when they contribute to the same winning way.
BONUS vault symbols start the feature when at least three appear. Four also pay 20x stake, five pay 200x and six pay 2,000x. The entry screen offers Mystery Symbol, Expanding Wilds and Multiplier Collect. Ordinary spins can receive random bonus symbols, Mystery symbols that reveal an identical symbol, or Full Reel Wilds.
Mystery Symbol begins with eight free spins and a randomly chosen target symbol. Whenever that symbol lands on reels 2–6, its position becomes a sticky Mystery position; every Mystery reveals the same symbol on that spin. A paying combination containing a newly landed target is credited before conversion, followed by another evaluation of the transformed grid. Filling a reel with Mystery positions adds one spin.
Expanding Wilds starts with ten spins: a Wild on reel 3 or 4 fills its reel and awards a respin, while each contributing win raises its multiplier by one. Respins repeat after a win or a second Wild landing on those reels. Multiplier Collect starts with twelve spins and uses coconut crates on reels 2–5 to build separate wild multipliers: every two coconuts add an upgrade and one progress notch. Completing three notches awards three spins and clears that meter.
Purchasing entry costs 100 stakes and leads to the same three bonus choices; Mystery Symbol was selected throughout this test. Its volatility meter shows four lit segments out of five. This build lists 96.20% RTP for regular play and 97.00% for purchases, with stakes of FUN 0.10–20. The listed maximum win is 49,999x.
Wild symbol
Scatter symbol
Multiplier
Sticky symbol
Free spins
Retrigger
Expanding symbol
Respin
Bonus buy
Bet range FUN 0.10 – 20 per spin · payouts read from the game's paytable at bet FUN 2.00
Gallery
5 frames from the demo session
Verdict
What happened before the Mystery symbols changedAn extension did almost nothing for purchase 6: its nine spins paid FUN 0.40. Purchase 33 went the other way, reaching eleven spins and FUN 1,620.80. Between those extremes, the median payout was FUN 62.50 and 38 of the 50 entries missed their FUN 200 price. Buying Mystery finished FUN 1,393.20 down.
Natural entry averaged one bonus per 400 ordinary spins, yet rounds 5694 and 7129 were separated by 1,434 spins without a trigger. Even the FUN 1,723.20 feature at round 4831 could not keep the ordinary series in profit: it finished FUN 609.40 down. That single payment contributed 8.62 percentage points to the recorded 96.95% RTP.
Before-conversion payments appeared on only four of the 210 natural free spins and totalled FUN 2. The transformed grids supplied FUN 6,163.80. On the last spin of bonus 1597, tens first formed a FUN 0.20 award, then became queens in a FUN 129.60 award: the same newly sticky positions participated in two differently valued combinations.
- Ordinary play produced a 162.6x result without opening a bonus, at round 5559.
- New Mystery positions can contribute to a win before conversion and another afterwards; round 1597 shows both payments.
- Completed sticky reels extended 17 of the 50 purchased features beyond their starting eight spins.
- The FUN 200 purchase had a FUN 62.50 median payout; 38 entries failed to cover the price.
- An internal gap of 1,434 spins separated natural bonus triggers.
- An extended feature can still return very little: nine spins paid FUN 0.40 in purchase 6.
Test record
10,000 rounds · 50 buys · open data · closed rigOne test run so far: a single session of the base game plus a separate series of bonus purchases on the official demo server, every request and response logged. 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
- 29%rounds that paid
- 862xbiggest round
- 1 / 400natural bonus rate
- 0.86xmean of 50 buys
- 23longest dry streak
01run Run 012026-09-12 measured return96.95%+0.8 pts vs declared
- 95% band
- 73.9–120.0%
- rounds that paid
- 29%
- biggest round
- 862x · round 4,831
- longest dry streak
- 23
- natural bonuses
- 25 · one per 400 rounds
- bonus buys
- mean 0.86x · median 0.313x · 76% below price
- balance start → end
- 5,000 → 4,391
- deepest drawdown
- 925x
10000 base-game spins at a fixed FUN 2.0 bet; 50 bonus buys at 200.0 each (100.0x); mode: Mystery Symbol selected for every natural and purchased feature on the official Relax Gaming demo server (jurisdiction MT, RTP profile 96.2%); every request and response logged; test run 2026-09-12.
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
7 questions · answered from the logIs Iron Bank’s Mystery Symbol bonus worth buying?
No. Mystery purchases at FUN 200 per entry returned a median FUN 62.50, with 38 of 50 payouts below the entry price. The series paid FUN 8,606.80 for FUN 10,000 spent. Buying avoided the wait for a natural trigger, but the sampled purchases still lost FUN 1,393.20; no purchase results for Expanding Wilds or Multiplier Collect are included.
Did Iron Bank leave long gaps between bonuses?
Yes: 1,434 non-triggering rounds lay between the bonuses at 5694 and 7129. Across the complete Iron Bank journal, 25 natural entries appeared in 10,000 FUN 2 spins, averaging one per 400. That average describes the recorded frequency, not a fixed interval built into the game.
Why can a Mystery symbol pay before it changes?
Newly landed target symbols are evaluated before conversion into sticky Mystery positions. The converted grid then receives another win evaluation. On free spin 9 of round 1597, tens contributed to FUN 0.20 before changing into queens in a FUN 129.60 combination; the round paid FUN 176.00 altogether, FUN 175.40 of it in free spins.
Who chooses which symbol becomes sticky?
The entry screen offers 3 bonus modes, and this test selected Mystery Symbol throughout. Its target symbol is assigned randomly and remains fixed for the feature, which begins with 8 spins. Selecting that mode does not offer a separate choice of target symbol.
How much did the biggest bonus change the measured RTP?
Round 4831 paid FUN 1,723.20, or 861.6 times its FUN 2 stake. Against FUN 20,000 wagered over the full Iron Bank series, that one payment supplied 8.62 percentage points of the observed 96.95% RTP. The 96.20% theoretical figure describes the game model, so proximity to it in this run does not make the result stable from session to session.
Why does another Iron Bank demo show 90% RTP?
Relax Gaming's product specification lists a 90% German profile. The build used for this review declared 96.20% for ordinary play and 97.00% for purchases. These percentages describe game versions and access modes; the measured return of a short session is a different quantity.
Are Full Reel Wild multipliers added together?
No, they multiply when the Full Reel Wilds contribute to the same win. Round 5559 had a 2x factor on reel 2 and 4x on reel 5, combining as 8x. Two six-reel pineapple ways, worth FUN 40 before multiplication, paid FUN 320.
Also tested
4 more slots on the same rig-
Razor Shark
Push Gaming · 10,000 spins
2026-10-16
RTP
82.8% 96.7%
hit24%
max1,016x
buy—
-
Golden Glyph
Quickspin · 10,000 spins
2026-10-01
RTP
93.8% 96.2%
hit35%
max78x
buy—
-
Snake Arena
Relax Gaming · 10,000 spins
2026-09-13
RTP
87.4% 96.3%
hit22%
max90x
buy1.08x
-
5 Lions Megaways 2
Pragmatic Play · 10,000 spins
2026-09-12
RTP
88.1% 96.5%
hit22%
max201x
buy0.84x
Field notes
0 notes