Oki Doki! BLACK
Explore this model alongside other AT pachislot machines in our Japanese pachislot machine library. For the basics, read how pachislot works in Japan.
Oki Doki! BLACK (沖ドキ！BLACK) is MIZUHO’s AT pachislot machine introduced in Japan on July 1, 2024. It keeps the series’ simple hibiscus-notification bonus loop while adding the Black Doki mode. Normal play uses internal modes, every-game bonus draws and rare-role opportunities, while post-bonus mode transitions determine the strength of the 32G continuation zone.
Last verified: October 8, 2026.
Key terms: AT · Setting · Initial hit · Payout rate · Net increase · Small role · Rare role · Watermelon · Bonus · Ceiling · Reset · Zone · Quit timing · Mode
Quick specs
Quick specs
| Item | Value |
|---|---|
| Official Japanese name | 沖ドキ！BLACK |
| Manufacturer | MIZUHO |
| Series | Oki Doki! |
| Machine type | AT |
| Japan rollout date | July 1, 2024 |
| Model | S/沖ドキ!BLACK/EP |
| Normal-play base | Approx. 32G per 50 coins (Administrator research) |
| Bonus net increase | Approx. 3.5 coins/G |
| Normal ceiling | 999G (Administrator research) |
| Post-bonus key window | 32G continuation zone (Administrator research) |
Setting probabilities and payout rate
Setting probabilities and payout rate
Administrator research. Setting 4 is not used.
| Setting | BB | RB | Bonus initial hit | Payout rate |
|---|---|---|---|---|
| 1 | 1/214.1 | 1/292.5 | 1/288.7 | 97.2% |
| 2 | 1/205.6 | 1/283.8 | 1/277.9 | 98.7% |
| 3 | 1/188.5 | 1/267.0 | 1/265.8 | 101.9% |
| 5 | 1/173.3 | 1/251.7 | 1/254.1 | 104.8% |
| 6 | 1/160.8 | 1/239.0 | 1/243.1 | 108.6% |
Small-role probabilities
Small-role probabilities
Administrator research. Cherry A is common across settings at approximately 1/44.3. Cherry B has a setting difference.
| Setting | Cherry B | Cherry combined |
|---|---|---|
| 1 | 1/168.0 | 1/35.0 |
| 2 | 1/152.4 | 1/34.3 |
| 3 | 1/145.6 | 1/34.0 |
| 5 | 1/136.5 | 1/33.4 |
| 6 | 1/128.5 | 1/32.9 |
Game flow
Game flow
Normal play continuously draws for a bonus from the current internal mode, with rare roles providing stronger opportunities. A hibiscus lamp notification confirms the bonus. After the bonus, the machine moves to another internal mode and the first 32G become the key continuation zone.
Higher internal modes strengthen the probability of repeated bonuses. Black Doki is the machine-specific addition and is designed as a route toward the stronger heaven-side mode structure.
Administrator research. Additional play and result interpretation:
A complete hibiscus-bonus cycle
- Normal play draws a pseudo-bonus. The hibiscus notification confirms a bonus; align the instructed combination and follow any stop navigation.
- Finish BIG or REG and then monitor the next-bonus game counter. A Kana-chan lamp stock creates a BIG 1G chain, while the 32G mode route is a separate mechanism.
- During the 32G route, another bonus redraws the next mode and restarts the next-bonus count. A chain length is therefore not the same as the length of one bonus.
- After the chain ends, read return-mode / normal-mode cues and the applicable protection. A section transition can select the model-specific special route.
Ceiling, reset and quit timing
Ceiling, reset and quit timing
Administrator research. Normal A uses the deepest 999G ceiling, while other modes can use shallower ceilings. After a true setting change, about 40% of starts enter the chance mode. When reset starts in Normal A or B, there is also a 25% game-count-shortening draw that can create a much earlier bonus.
After every bonus, play through at least the 32G continuation zone before treating the machine as finished. If notification patterns or other mode clues suggest Normal B or a higher mode, quitting immediately after 32G can discard meaningful mode value.
Bonus and mode-loop details
Bonus and mode-loop details
Bonuses run at approximately 3.5 coins/G. The machine’s output comes primarily from repeated bonuses after transitions into heaven-side modes. The Black Doki route adds another mode-transition opportunity while preserving the series’ simple hibiscus-notification play style.
Administrator research. Additional play and result interpretation:
| Bonus | Duration / approximate gain | Net speed |
|---|---|---|
| BIG (ビッグ) | 60G; approx. 210 coins | Approx. 3.5 coins/G |
| REG (レギュラー) | 25G; approx. 90 coins | Approx. 3.5 coins/G |
The gains describe the bonus portion, not a net profit from the start of the session. During a bonus, the published 1G-stock draws are cherry 1.0%, watermelon 3.3%, and guaranteed for a confirmed special role or middle cherry. Those are conditional draws after the indicated role; they are not standalone per-game probabilities.
The Kana-chan lamp is a BIG 1G-stock cue. A lit cue and a high-next-mode hint answer different questions: one announces a specific stored reward, while the other describes the next-bonus route.
Setting differences and identification
Setting differences and identification
Bonus initial-hit probability and BB/RB appearance both improve toward higher settings. Cherry B also becomes more frequent. Because the machine’s internal mode strongly affects short-term bonus frequency, use the setting-sensitive cherry sample and longer-session bonus data together rather than judging from one short heaven loop.
Administrator research. Additional play and result interpretation:
Separate normal-play initial bonuses from chained bonuses when recording performance. Mode allocation strongly changes the short-term bonus frequency; a long chain is useful for the current reward state but is not a direct high-setting confirmation. The setting rows for this model omit Setting 4; do not fill that gap with an interpolated value.
Statistical setting ranges
Japanese Slot Guide calculation. The expected counts and central 95% count ranges below are calculated from the listed setting probabilities with a binomial model. They describe ordinary statistical variation under that probability; they are not confidence percentages for the actual setting.
Cherry B
Administrator-research per-game Cherry B probability. Cherry A is common across settings, so only the setting-sensitive Cherry B flag is modelled here.
1,000 games
| Setting | Listed rate | Expected count | Central 95% range | Δ vs S1 | Relative difference |
|---|---|---|---|---|---|
| 1 | 1/168.0 | 6.0 | 2–11 | — | — |
| 2 | 1/152.4 | 6.6 | 2–12 | +0.6 | +10.2% |
| 3 | 1/145.6 | 6.9 | 2–12 | +0.9 | +15.4% |
| 5 | 1/136.5 | 7.3 | 3–13 | +1.4 | +23.1% |
| 6 | 1/128.5 | 7.8 | 3–14 | +1.8 | +30.7% |
3,000 games
| Setting | Listed rate | Expected count | Central 95% range | Δ vs S1 | Relative difference |
|---|---|---|---|---|---|
| 1 | 1/168.0 | 17.9 | 10–27 | — | — |
| 2 | 1/152.4 | 19.7 | 12–29 | +1.8 | +10.2% |
| 3 | 1/145.6 | 20.6 | 12–30 | +2.7 | +15.4% |
| 5 | 1/136.5 | 22.0 | 13–32 | +4.1 | +23.1% |
| 6 | 1/128.5 | 23.3 | 14–33 | +5.5 | +30.7% |
5,000 games
| Setting | Listed rate | Expected count | Central 95% range | Δ vs S1 | Relative difference |
|---|---|---|---|---|---|
| 1 | 1/168.0 | 29.8 | 20–41 | — | — |
| 2 | 1/152.4 | 32.8 | 22–44 | +3.0 | +10.2% |
| 3 | 1/145.6 | 34.3 | 23–46 | +4.6 | +15.4% |
| 5 | 1/136.5 | 36.6 | 25–49 | +6.9 | +23.1% |
| 6 | 1/128.5 | 38.9 | 27–52 | +9.1 | +30.7% |
8,000 games
| Setting | Listed rate | Expected count | Central 95% range | Δ vs S1 | Relative difference |
|---|---|---|---|---|---|
| 1 | 1/168.0 | 47.6 | 35–62 | — | — |
| 2 | 1/152.4 | 52.5 | 39–67 | +4.9 | +10.2% |
| 3 | 1/145.6 | 54.9 | 41–70 | +7.3 | +15.4% |
| 5 | 1/136.5 | 58.6 | 44–74 | +11.0 | +23.1% |
| 6 | 1/128.5 | 62.3 | 47–78 | +14.6 | +30.7% |
How to read this: overlapping ranges are expected. A result inside one setting’s range can also be plausible under another setting. Do not use these ranges as a setting confirmation or as a promise of future results.
Normal-play and 32G chain modes
Normal-play and 32G chain modes
Administrator research. Oki Doki! BLACK uses internal modes to control bonus likelihood, the maximum game count and the strength of the 32G continuation route. The quick-chain modes should not be confused with a guaranteed long AT; they are bonus-repeat states.
| Mode | Maximum / characteristic |
|---|---|
| Normal A | 999G; base mode |
| Normal B | 999G; cannot fall before Heaven-or-better and has a stronger Heaven promotion route |
| Return | 200G; increased early bonus chance |
| Chance | 200G; routes to Normal B or Heaven-or-better |
| Heaven | 32G; high bonus-repeat probability |
| DokiDoki | 32G; high-loop chain mode |
| Super DokiDoki | 32G; stronger high-loop chain mode |
| Guarantee | 32G; entered after DokiDoki/Super DokiDoki falls |
| Black Doki | 32G; special route selected from the non-advantageous interval |
After a setting change, current research distributes Normal A / Normal B / Chance, with Chance selected frequently. Mode observations and 32G behavior are useful for play-state interpretation, but they do not identify the setting by themselves.
Administrator research. Additional play and result interpretation:
| Mode family | Next-bonus maximum | Progression |
|---|---|---|
| Normal A / B (通常A・B) | 999G | Normal B supports progression toward Heaven |
| Return / Chance (引き戻し・チャンス) | 200G | Separate earlier normal-play routes |
| Heaven (天国) | 32G | Ordinary short chain |
| Doki Doki (ドキドキ) | 32G | Approx. 80% loop; falls to guarantee mode |
| Super Doki Doki (超ドキドキ) | 32G | Approx. 90% loop; falls to guarantee mode |
| Guarantee (保障) | 32G | Post-Doki protection |
| Black Doki (黒ドキ) | 32G | Its bonus leads to Heaven or higher |
A 32G bonus is an observed result; it does not on its own identify which of the 32G modes was active. Strong loop modes and guaranteed stock can produce similar timing. Use a specific hibiscus pattern or sound law where its interpretation is published, and leave the exact mode unclassified otherwise.
Setting hints and confirmed-setting elements
Setting hints and confirmed-setting elements
Administrator research. Additional setting hints and result interpretation:
Examples of mode cues
| Hibiscus / lamp cue | Published next-mode implication |
|---|---|
| Right-only, panel off, or the relevant colourful pattern | Heaven or higher |
| Left-only pattern | Doki Doki or higher |
| Doki Doki lamp | Super Doki Doki |
These are mode implications. They are not setting floors and should not be entered as evidence for Setting 4 or 6. Use the complete pattern; a partially noticed flash is insufficient to choose the stronger interpretation.
How to play
How to play
No navigation: stop the left reel first. If numbered stop instructions appear, press the stop buttons in the displayed order (1, then 2, then 3). A symbol-target instruction tells you which symbol to aim for; follow it together with any displayed stop order.
This machine recommends left-first play. Aim BAR on the left reel to cover rare roles. If watermelon stops, cover watermelon on the middle and right reels using the bonus symbols as guides. During bonuses, follow every push-order navigation prompt; navigation-free games can be played with the same rare-role procedure.
Data policy and official references
Data policy and official references
First-party manufacturer information is labelled official. Administrator research identifies the administrator’s review of published information; it does not by itself mean original measurement or manufacturer confirmation. Calculated examples are labelled separately and explain their inputs. A page verification date records an editorial check, not a new experiment or a remeasurement of every value. See our editorial policy for the distinction.