Pragmatic Play · 2023 · measured RTP 104.8% · tested 2026-10-15
Gravity Bonanza
Black holes outpaid blocks in Gravity Bonanza's first run with 64.3% of the money, and one free spin pulled 23 purple planets into a x3 meter for 1,500x; 20,000 demo rounds gave 104.8% RTP.
In numbers: the lab's RTP test on the official demo server measured 104.8% against 96.09% declared over 20,000 logged rounds in 2 runs; 38.0% of rounds paid; a natural bonus landed once per 290 rounds (69 in total) and a bonus round paid a median 24.1x the stake, mean 117.5x, trigger spin included; 100 bonus buys at 100x returned 0.89x of their price on average, 63% of them below the price; the biggest round paid 1,850.6x; the longest dry run was 17 spins.
In the lab’s research: Slot volatility, measured · Are online slots rigged? · Declared vs measured RTP — this test is part of their data
Gravity Bonanza demo
United States·available at Cafe Casino
Same reels, real payouts
Cafe Casino runs the same Gravity Bonanza 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
20,000 spins · USD 2.00 bet · every request logged
| Spins | 20,000 · 2 runs |
| Bet | USD 2.00 |
| RTP declared | 96.09% |
| RTP measured | 104.84% (approximate 95% CI 81.1–128.6) |
| Hit frequency | 38% · every 2.64 |
| Dead streak max / avg | 17 / 2.63 |
| Median hit | 0.75x |
| Max win (no bonus round) | 602.1x · run 1, round 1027 |
| Free spins, natural | 69 · 3.5 bHz · every 289.9 spins · mean bonus round payout 117.5x stake |
| Balance start → end | 100,000 → 101,936 |
- 012026-09-2010,000 rounds · 50 buysfiles & checksums ↓111.51%RTP5 files · SHA-256 ↓
- 022026-10-1510,000 rounds · 50 buysfiles & checksums ↓98.17%RTP5 files · SHA-256 ↓
each run keeps its own spin log, CSV and raw server journal with checksums; the figures on this card combine all runs
Bonus buy lab
100 buys × 100x · USD 200 each
mean 0.89x · median 0.233× price (USD 46.50) · 63 of 100 below price · best 6.36x · worst 0.03x
| Spins per bonus (avg / min–max) | 12 / 10–30 |
| Retriggered | 12% |
| Bonuses that paid nothing | 0% |
UFOs landing three or more at a time inside the feature count as a retrigger here, ten extra spins each: six of the 50 tickets got one in each run, and ten natural features have, four in run one and six in run two. Tickets that opened with 15 spins from four UFOs on the buying spin are not counted.
- Spent
- USD 20,000100 × USD 200
- Returned
- USD 17,882.9089.41% · approximate 95% CI 67–112%
- Net
- −USD 2,117.10−10.6 buys
- Break-even or better
- 37 / 10037%
- Paid 2× price or more
- 15 / 10015%
- Price in base spins
- 100natural trigger every ~290 spins
One ticket equals 100 ordinary stakes. Natural bonuses occurred once per 290 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 the 2 runs in sequence needed
| 50 bets | bust at spin 184 |
| 100 bets | bust at spin 280 |
| 200 bets | survived all 20000 spins |
The runs are played back to back as one series, one bet size. A different session can bust earlier or never; treat this as a measured example, not a rule.
How it plays
7 rules screens from the game
Gravity Bonanza is played on a seven-by-seven grid set above a candy-coloured moonscape, and a win needs a connected group of at least five matching symbols, joined side by side or one above another, anywhere on the screen. The blue Moon leads the paytable: a group of five Moons is worth 1x the stake, fifteen are worth 150x and 31 or more hit the 10,000x cap; behind it come the burger planet, purple planet, pink star, sushi roll, green orb and red ringed planet, five red planets being worth 0.2x. After a win the paid symbols vanish, the survivors slide down, fresh symbols top up the grid from above, and the cycle continues as long as new groups keep forming.
The Black Hole is the game's own device. Only one can appear per spin and its tumbles; when it lands, the game picks a random paying symbol, and every copy of that symbol on the screen and in the tumbles that follow is pulled into the Gravity Bonus meter. When the tumbles stop, the meter pays the block price of the collected symbol for the number collected, so 19 Moons gathered in round 1027 of the first run paid 600x, exactly what a 19-symbol block would have.
Bonus UFOs open the feature: 3 of them anywhere pay 10 free spins, 4 pay 15, 5 pay 20, 6 pay 30 and 7 pay 50, and the same counts landing inside the feature add the same numbers again. During free spins the Black Hole arrives with a random x2, x3, x5 or x10 multiplier that applies to the Gravity Bonus alone, and the rules note that special reels are in play. A round that reaches 10,000x the stake ends on the spot and forfeits the remaining spins.
Buy Free Spins is priced at 100 stakes, which at the USD 2 bet means a USD 200 ticket, and the buying spin may land three to seven UFOs at random. The rules page calls the game medium volatility and prints 96.09% RTP for ordinary play and 95.99% for the purchase; stakes start at USD 0.20 and stop at USD 240.
Cluster pays
Cascading reels
Scatter symbol
Free spins
Retrigger
Multiplier
Bonus buy
On narrow screens, swipe or use arrow keys to view all payouts.
Bet range USD 0.20 – 240 per spin · payouts read from the game's paytable at bet USD 2.00
Gallery
10 frames from the demo session
Verdict
Black holes still pay the feature
Black holes have paid 56.8% of everything returned in run two and 64.3% in run one, and inside free spins their share is higher still: 86.8% of run two's USD 7,450.10 free spins money came from 142 collections, 33 of the 36 features landing at least one multiplied award. Three run-two features each produced one USD 800 award, 400 stakes from a single collection, where run one's round 5105 took USD 3,000 from 23 planets at x3; no round of run two passed 433.6x.
Run one and run two returned 111.51% and 98.17% on 10,000 USD 2 rounds each, 104.84% pooled (approximate 95% CI 81.13%–128.55%, which describes how precisely the mean is known) against 96.09% in the rules; without run one's round 5105 the remaining 19,999 rounds returned 95.59%. Sixty-nine natural features arrived, one per 290 rounds, at a 24.05x median, ten of them retriggered; hit rates ran 37.41% and 38.49%, and no blank stretch exceeded 17 rounds in either run.
Across 100 USD 200 purchases the return stands at USD 17,882.90, 89.41% of cost, with a USD 46.50 median, 63 under price and one past five times, run one's ticket 47 at USD 1,272.70. Run two's batch came to 82.24% with USD 611.90 as its best, ticket 32, whose last spin collected 16 symbols at x2 for USD 480; twelve tickets in all retriggered, and black holes supplied 80.4% of run two's purchased free-spin money.
- Three natural features in run two each collected USD 800 on one black hole, rounds 755, 1853 and 7032
- Hits came every 2.6 rounds in run two and the balance never fell more than 183.5 stakes under its start
- Thirty-three of run two's 36 features included a multiplied black-hole award
- Six of run two's natural features retriggered for ten extra spins, after four in run one
- No round of run two passed 433.6x, against 1,850.6x in run one
- The median USD 200 ticket has paid just USD 46.50 over 100 purchases
- Fewer than five symbols, and so no payout, came from 219 of run two's 721 ordinary black holes
- Purchases slipped to 82.24% of cost in run two from 96.59% in run one
Run 01·2026-09-20·111.51%
Ten thousand ordinary spins returned 111.51% of stake against the 96.09% in the rules, and the approximate 95% band, 68.7 to 154.3%, stretches that far because of a single outlier. Round 5105 paid USD 3,701.20, 1,850.6x the stake, across 30 free spins; without it the other 9,999 rounds returned 93.02%. The balance closed at USD 102,302.80, 1,151 stakes up, but fifty stakes lasted only 184 spins on the way and a hundred lasted 280.
Black holes did the paying. In ordinary play one landed every 13.5 rounds, 741 times in all, and their awards made 46.7% of everything the reels returned outside the feature; across the whole series, natural free spins included, 64.3% of the return came through the Gravity Bonus meter and 35.7% through ordinary blocks. The base record, 602.05x on round 1027, was one black hole that gathered 19 Moons for USD 1,200 after three blocks worth USD 4.10 together.
Purchases fared worse: fifty tickets at USD 200 came back at 0.9659x of price on average, 96.59% against the 95.99% printed for the buy, yet the median ticket returned 0.2175x, USD 43.50, and 32 of the 50 lost money. Ticket 47 carried the sample: on its tenth spin a x3 black hole collected 17 burger planets for USD 1,200 of its USD 1,272.70, and without that ticket the other 49 returned 0.8557x. Six tickets retriggered, ten extra spins apiece, and three opened with 15 spins from four UFOs.
One collection can be the whole feature. Round 5105 started with ten spins, added ten on its fourth spin and ten again on its eleventh, and in between took USD 500 from 20 purple planets on spin ten and USD 3,000 from 23 of them under a x3 multiplier on spin eleven. Those two awards were 94.6% of the USD 3,698.70 the free spins paid; everything else in the free spins, 28 other spins and the blocks beside those two collections, came to USD 198.70.
Run 02·2026-10-15·98.17%
Three natural features each produced a single USD 800 black-hole award, 400 stakes from one collection: round 755 gathered 18 symbols under a x10 multiplier on its eighteenth spin, round 1853 took 16 at x2 on spin fifteen, and round 7032 took 23 at x2 on spin five. Those three rounds finished at USD 846.40, USD 867.20 and USD 836.10, the three largest of the run, and round 46 added USD 761.30, USD 480 of it from one x2 collection of 17 symbols on spin three. In all, 36 features arrived, one per 278 rounds, six of them retriggered for ten extra spins, and their 142 black holes paid 86.8% of the USD 7,450.10 won in free spins.
The 10,000 USD 2 rounds returned 98.17%: 6,151 paid nothing, the longest blank run was 17 rounds, and the balance's lowest point was 183.5 stakes under its start. Ordinary black holes landed 721 times, one per 13.9 rounds, 219 of them with fewer than five symbols and no payout; the largest, 20 symbols at round 1845, paid USD 300. The batch of fifty USD 200 tickets returned 82.24% of cost with a USD 55.80 median and 31 under price; ticket 32 led at USD 611.90 after a x2 hole collected 16 symbols for USD 480 on its twentieth and final spin, and ticket 30 ran 30 spins through two retriggers for USD 572.
Test record
2 runs · 20,000 rounds · 100 buys · open data · closed rig
This game has been through 2 separate test runs on the official demo server, each a fresh session of 10,000 rounds at a fixed bet. Every figure on this page combines the runs into one sample, as if they were one long session; the record below keeps each run apart, with its own numbers and its own downloadable log.
- 20,000rounds, all runs
- 38%rounds that paid
- 1,851xbiggest round
- 1 / 290natural bonus rate
- 0.89xmean of 100 buys
- 17longest dry streak
01run Run 012026-09-20 measured return111.51%+15.4 pts vs declared
- 95% band
- 68.7–154.3%
- rounds that paid
- 37%
- biggest round
- 1,851x · round 5,105
- longest dry streak
- 17
- natural bonuses
- 33 · one per 303 rounds
- bonus buys
- mean 0.97x · median 0.218x · 64% below price
- balance start → end
- 100,000 → 102,303
- deepest drawdown
- 1,367x
02run Run 022026-10-15 lab note measured return98.17%+2.1 pts vs declared
- 95% band
- 77.8–118.6%
- rounds that paid
- 38%
- biggest round
- 434x · round 1,853
- longest dry streak
- 17
- natural bonuses
- 36 · one per 278 rounds
- bonus buys
- mean 0.82x · median 0.279x · 62% below price
- balance start → end
- 100,000 → 99,633
- deepest drawdown
- 1,443x
Run two's 98.17% sits 13 points under run one's 111.51%, with no round past 433.6x after run one's 1,850.6x, yet 36 natural features against 33 and a higher median feature, 27.07x against 18.85x. Black holes supplied 56.8% of the run's payouts after 64.3%, and the purchase batch fell to 82.24% of cost from 96.59%, with nothing above USD 611.90.
2 test runs combined into one sample (2026-09-20, 2026-10-15): 20,000 ordinary rounds, including naturally triggered features, at a fixed USD 2 bet; 100 bonus buys at USD 200 each (100x); recorded on the official Pragmatic Play demo server (jurisdiction 99, RTP profile 96.09%); every request and response logged.
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 → One test, step by step →
FAQ
5 questions · answered from the log
Is Gravity Bonanza still above 96.09% after two runs?
Yes. Pooled, 20,000 USD 2 rounds stand at 104.84%, though run two alone returned 98.17%, USD 19,633.10 on USD 20,000, after 111.51% in run one.
Which black holes were the biggest of run two?
Three awards of USD 800 each: 18 symbols at x10 on spin 18 of round 755, 16 at x2 on spin 15 of round 1853 and 23 at x2 on spin 5 of round 7032. Outside free spins the largest was USD 300 for 20 symbols at round 1845.
Do black holes land often outside the feature?
Yes: 721 times in run two's 10,000 rounds, one per 13.9, with 502 reaching the five-symbol minimum and paying 4.67 stakes on average at a 1.0x median; the other 219 gathered fewer than five and paid nothing. Run one logged 741, one per 13.5.
Did ticket returns hold up in run two?
No. The batch returned USD 8,223.90, 82.24% of cost, after 96.59% in run one; the median ticket paid USD 55.80, 31 of 50 paid under price, six doubled it and none reached five times. Ticket 32's USD 611.90 was the best, with USD 480 from a x2 collection of 16 symbols on its final spin.
How many retriggers did run two produce?
Six natural features and six tickets, ten spins each time; ticket 30 retriggered twice and ran 30 spins for USD 572. Five tickets opened with 15 spins from four UFOs on the buying spin, and ticket 28 opened with 30 from six.
Comments and reviews
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- spins20,000
- bet2.00
- result+968x
- RTP measured104.8%
- bonuses69
- max win, no bonus602.1x
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