Relax Gaming · tested 2026-09-18
Hellcatraz
A single mystery reveal paid FUN 600 of the FUN 630.60 in round 599 of this Hellcatraz review, and the demo in Mixed mode returned 95.47% RTP against the 96.30% in its rules.
Test card
10,000 spins · FUN 2.00 bet · every request logged| Spins | 10,000 |
| Bet | FUN 2.00 |
| RTP declared | 96.30% |
| RTP measured | 95.47% (approximate 95% CI 82.1–108.8) |
| Hit frequency | 24% · every 4.22 |
| Dead streak max / avg | 28 / 4.29 |
| Median hit | 1.50x |
| Max win (base game) | 315.3x · spin 599 |
| Free spins, natural | 2 · every 5000 spins · mean FS-only payout 124.3x stake |
| Balance start → end | 5,000 → 4,093 |
each run keeps its own spin log, CSV and raw server journal with checksums; the figures on this card combine all runs
Play Hellcatraz demo
same math as real play · demo balance
Bonus buy lab
50 buys × 200x · FUN 400 eachmean 0.83x · median 0.42575× price (FUN 170.30) · 38 of 50 below price · best 4.23x · worst 0.01x
| Spins per bonus (avg / min–max) | 6 / 5–8 |
| Retriggered | 64% |
| Bonuses that paid nothing | 0% |
Extra spins come from Golden Mystery cells inside Super Free Spins: two cascades on one add a single spin. The share counts purchased features that ran past their five-spin start; the meter fill that opens the feature is not a retrigger.
- Spent
- FUN 20,00050 × FUN 400
- Returned
- FUN 16,55782.79% · approximate 95% CI 55–110%
- Net
- −FUN 3,443−8.6 buys
- Break-even or better
- 12 / 5024%
- Paid 2× price or more
- 6 / 5012%
- Price in base spins
- 200natural trigger every ~5,000 spins
One ticket equals 200 ordinary stakes. Natural bonuses occurred once per 5,000 paid 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 130 |
| 200 bets | bust at spin 567 |
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
24 rules screens from the game
Hellcatraz plays on six reels of six rows with 46,656 ways: a symbol pays when it appears on each reel in turn from the leftmost one, and several copies on one reel multiply the ways. Nine symbols pay, from the Warden at FUN 4 for six of a kind at the FUN 2 stake down to the four low symbols at FUN 0.80; reels two through six carry a Wild. Winning symbols leave the board and new ones drop in, so a stake can run through several screens.
The cells framed as prison windows are Mystery symbols. Each carries a counter that drops by one with every cascade, and when it reaches zero all Mystery cells on the board turn into one symbol at once. Before the first spin the game asks for a mode: Lockdown gives every Mystery cell the same counter, Mixed keeps two independent counters, and the rules list 96.46% RTP for Lockdown against 96.30% for Mixed. The demo server starts in Mixed mode and the whole series stayed there.
Key symbols fill a meter beside the reels; 2,000 keys start Super Free Spins with five spins. During the feature Mystery cells reveal as soon as they land, and a Golden Mystery cell needs two cascades to add one extra spin, which is the only way the feature grows. The meter keeps counting in both modes and carries any surplus over into the next collection.
Buy Feature costs 200 times the stake, FUN 400 at FUN 2, and opens the five spins at once; a top-up option sells only the keys still missing at 0.1 stakes each. The build quotes 96.83% for the purchase, a 51,843x cap, stakes between FUN 0.10 and FUN 1,000, and marks Mixed mode as high volatility and Lockdown as super high.
Cascading reels
Wild symbol
Free spins
Retrigger
Bonus buy
Bet range FUN 0.10 – 1000 per spin · payouts read from the game's paytable at bet FUN 2.00
Gallery
10 frames from the test
Verdict
One reveal cascade, most of the roundIn Mixed mode the series returned 95.47% of stake, 0.83 points under the 96.30% the rules give for that mode, with an approximate 95% band of 82.1 to 108.8%. A hit landed on 23.67% of spins, the median hit was 1.5x, and the balance never went far: 381 stakes up on spin 2,865, 709 down on spin 9,145, 453 down at the close. The first thousand spins paid 128.8%, the sixth thousand 69.4%.
The key meter is slow. It needed 4,583 spins to fill the first time and 4,563 the second, and the two Super Free Spins it opened paid 103.8x and 144.7x the stake, together 2.6% of everything the series returned. Purchases at FUN 400 came back at 0.83x of price on average and 0.42575x in the middle, FUN 170.30; 38 of 50 lost, five returned FUN 40 or less, and the best, buy 10, paid FUN 1,690 with FUN 1,200.80 arriving on its first free spin. Thirty-two of the fifty features grew past five spins through Golden Mystery cells.
The money in the base game sits in one moment. All six rounds above 100x were ordinary spins, and in every one the last cascade, the screen on which the Mystery counters reached zero, paid 94 to 99% of the round: round 599 ran five screens for FUN 30.60, then 21 cells became clovers for FUN 600; round 6879 paid FUN 15.20 on two screens and FUN 576 when 15 cells turned into handcuffs. Reveals happened in 188 of 10,000 rounds, and the 288 rounds that cascaded twice or more, 2.9% of the series, carried 39.3% of the payout.
- A five-cascade chain in ordinary play reached 315.3x in round 599; six base-game rounds passed 100x without a bonus
- Hits landed on 23.67% of spins at a 1.5x median, and the longest drought in the series was 28 spins
- Two Super Free Spins from the key meter paid 103.8x and 144.7x the stake
- The log keeps each round's cascades, reveals and key count, and the mode played is on record
- 95.47% measured against 96.30% for Mixed mode; the sixth thousand spins returned 69.4%
- The meter took about 4,570 spins per bonus, so the feature came twice in the whole series
- Fifty purchases at FUN 400 returned 0.83x of price; 38 lost and five came back with FUN 40 or less
- Nine dead stretches of 20 spins or more; a 50-stake bankroll was gone by spin 75 and 200 stakes by spin 567
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
- 24%rounds that paid
- 315xbiggest round
- 1 / 5,000natural bonus rate
- 0.83xmean of 50 buys
- 28longest dry streak
01run
Run 012026-09-18
10,000 rounds at FUN 2.00 · 50 buys · rig 0.6.0 · RTP profile 96.30%
measured return95.47%-0.8 pts vs declared
Run 012026-09-18
10,000 rounds at FUN 2.00 · 50 buys · rig 0.6.0 · RTP profile 96.30%
- 95% band
- 82.1–108.8%
- rounds that paid
- 24%
- biggest round
- 315x · round 599
- longest dry streak
- 28
- natural bonuses
- 2 · one per 5,000 rounds
- bonus buys
- mean 0.83x · median 0.43x · 76% below price
- balance start → end
- 5,000 → 4,093
- deepest drawdown
- 1,090x
10000 ordinary paid rounds, including naturally triggered features, at a fixed FUN 2.0 bet; 50 bonus buys at 400.0 each (200.0x); mode: MIXED on the official Relax Gaming demo server (jurisdiction MT, RTP profile 96.3%); every request and response logged; test run 2026-09-18.
The test rig recorded every round on the official demo server. Screenshots and video were captured in a separate browser session and are not part of the statistical samples. This release has completed automated data, content and page checks; human editorial review is pending. How we test →
FAQ
7 questions · answered from the logHellcatraz RTP: what did the demo actually pay?
95.47% of stake over the logged series in Mixed mode, approximate 95% band 82.1 to 108.8%, against 96.30% in the rules for that mode; Lockdown is listed at 96.46% and the purchase at 96.83%. The return moved by thousand-spin block from 128.8% down to 69.4% and finished 453 stakes below the start.
Where do the big wins come from if there are no multipliers?
From the reveal. In all six rounds above 100x the last cascade, when the Mystery counters hit zero, paid 94 to 99% of the round: FUN 600 of FUN 630.60 in round 599 after 21 cells became clovers, FUN 576 of FUN 591.20 in round 6879 from 15 handcuffs. Reveals landed in 188 of 10,000 rounds.
How long does it take to collect 2,000 keys?
4,583 spins for the first meter and 4,563 for the second at a fixed FUN 2 stake, two Super Free Spins in the whole series. The first paid 103.8x the stake over seven spins, the second 144.7x over five, and the meter kept three surplus keys after the second trigger.
Buy Feature at 200x: did the tickets pay for themselves?
At FUN 400 a ticket, the 50 purchases returned 0.82785x of price on average and 0.42575x in the middle, FUN 170.30 for a FUN 400 ticket; 38 lost and 12 covered the price. The best, buy 10, paid FUN 1,690, with FUN 1,200.80 on its first spin; the worst, buy 36, paid FUN 2. Different payout bases keep this from proving whether buying or waiting is the better route.
Mixed or Lockdown: which mode was tested?
Mixed, the mode the demo server opens in: every one of the 10,000 spin responses reports it, and the purchases used the same session. Mixed keeps two independent Mystery counters and is listed at 96.30% RTP; Lockdown gives all Mystery cells one counter at 96.46% and is marked super high volatility. Lockdown was not measured.
Do the five free spins ever get longer?
Yes, through Golden Mystery cells: two cascades on one of them add a spin. Of the 50 purchased features, 18 stayed at five spins, 17 reached six, 12 reached seven and three reached eight; the natural bonus on round 4583 ran seven spins.
What share of spins paid nothing at all?
On 76.33% of spins. Nine dry stretches ran 20 spins or longer, the longest 28 from round 6487 to 6514, and the average gap between hits was 4.22 spins; the deepest fall from a balance peak was 1,089.9 stakes, reached on spin 9,145.
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Field notes
0 notes