> For the complete documentation index, see [llms.txt](https://docs.cybercookie.party/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cybercookie.party/casino.md).

# Casino: Cookie Spin & Mines

The casino is on **Earn → Casino**. Two games. Both are **server-authoritative** (the RNG and, for Mines, the secret mine positions live on the server — the client can't peek or cheat) and both feed the shared **Top jackpot / Total won / Total lost** counters shown at the top of the tab.

> **Gamble responsibly with coins you can afford to lose.** Both games have a built-in house edge, so over many plays you lose on average. They're a coin sink with upside, not a reliable income source.

***

## 🍪 Cookie Spin

A single-shot bet with weighted multipliers.

* **Bet range:** 10,000 – 1,000,000.
* You bet, it rolls once, you win `bet × multiplier` (or lose the bet on a ×0).

### Exact odds

| Chance | Multiplier | Outcome       |
| ------ | ---------- | ------------- |
| 55%    | ×0         | lose your bet |
| 25%    | ×1.5       | +50%          |
| 12%    | ×2         | double        |
| 6%     | ×3         | triple        |
| 2%     | ×5         | jackpot       |

### Expected value

```
EV = 0.55×0 + 0.25×1.5 + 0.12×2 + 0.06×3 + 0.02×5
   = 0.895  →  you keep ~89.5% of your bet on average
```

**House edge ≈ 10.5%.** Bigger bets don't change the odds — they just scale the variance.

***

## 💣 Mines

A cash-out game on a **5×5 grid (25 tiles)**. You choose how many **mines** to hide (1–24), then reveal tiles one at a time. Each safe tile raises your multiplier; hit a mine and you lose the bet. **Cash out** any time to bank `bet × current multiplier`.

* **Bet range:** 10,000 – 1,000,000.
* The bet is only settled when you **bust** (lose it) or **cash out** (win the net). If the server restarts mid-game, the round is voided and you lose nothing.

### The multiplier formula (exact)

After revealing `k` safe tiles with `M` mines on the board:

```
multiplier(k) = 0.97 × Π (from i=0 to k−1) of  (25 − i) / (25 − M − i)
```

The `0.97` is a **\~3% house edge**. The product term is the fair "inverse probability" of having survived `k` reveals.

### Risk: chance of hitting a mine on the *next* tile

```
P(next tile is a mine) = mines_remaining / tiles_remaining
```

So with 3 mines and no reveals yet: `3/25 = 12%` per tile. As you reveal safe tiles, the danger per remaining tile **rises** (fewer safe tiles left), while the multiplier climbs.

### Multiplier table

Rows = number of **mines** on the board, columns = number of **gems** (safe tiles) you've revealed. The value is your cash-out multiplier at that point (`×0.97` house edge already applied). `—` means there aren't that many safe tiles left.

| Mines \ Gems | 1      | 2      | 3       | 4        | 5         | 8         | 12        | 20        |
| ------------ | ------ | ------ | ------- | -------- | --------- | --------- | --------- | --------- |
| **1**        | ×1.01  | ×1.05  | ×1.10   | ×1.15    | ×1.21     | ×1.43     | ×1.87     | ×4.85     |
| **2**        | ×1.05  | ×1.15  | ×1.26   | ×1.39    | ×1.53     | ×2.14     | ×3.73     | ×29.10    |
| **3**        | ×1.10  | ×1.26  | ×1.45   | ×1.68    | ×1.96     | ×3.28     | ×7.80     | ×223.10   |
| **4**        | ×1.15  | ×1.39  | ×1.68   | ×2.05    | ×2.53     | ×5.16     | ×17.16    | ×2454.10  |
| **5**        | ×1.21  | ×1.53  | ×1.96   | ×2.53    | ×3.32     | ×8.33     | ×40.04    | ×51536.10 |
| **7**        | ×1.35  | ×1.90  | ×2.73   | ×4.01    | ×6.01     | ×23.98    | ×271.72   | —         |
| **10**       | ×1.62  | ×2.77  | ×4.90   | ×8.99    | ×17.16    | ×163.03   | ×11086.35 | —         |
| **15**       | ×2.42  | ×6.47  | ×18.59  | ×58.43   | ×204.51   | ×23313.95 | —         | —         |
| **20**       | ×4.85  | ×29.10 | ×223.10 | ×2454.10 | ×51536.10 | —         | —         | —         |
| **24**       | ×24.25 | —      | —       | —        | —         | —         | —         | —         |

More mines = faster multiplier growth **but** far higher bust risk. Fewer mines = safer, slower climbs. Your payout is `bet × multiplier` when you cash out.

### Strategy

* **Fewer mines (1–3):** low variance, small steady multipliers. Good for grinding modest profits.
* **More mines (10–24):** high variance, big multipliers, big bust chance — lottery mode.
* **Always cash out** before greed catches up: the expected value of the *next* reveal is `(survival chance) × (next multiplier) − (current, banked value)`. Once the marginal reveal is negative EV for your risk tolerance, cash out.
* Because of the 3% house edge, the long-run EV is slightly under 1.0 no matter your mine count — it's the **variance** you're choosing.

Next: [Tasks, Daily Crate, Referrals & Codes →](/tasks-rewards.md)


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