OPDUEL

Fairness

Limbo

Plinko

Keno

Roulette

Mines

Blackjack

Roll

Dice

Limbo

Set a target multiplier and the game instantly reveals a crash point. Hit your target or higher and you win - fall short and you lose. Limbo runs at 96% RTP, meaning roughly 4% of rounds crash instantly at 1.00x.

Verify Game Fairness

The Algorithm

// Step 1: Generate hash
const message = `${clientSeed}:${nonce}:0`;
const hash = HMAC_SHA256(serverSeed, message);

// Step 2: Extract float from first 4 bytes
const bytes = hash.slice(0, 4);
let float = 0;
for (let i = 0; i < 4; i++) {
    float += bytes[i] / Math.pow(256, i + 1);
}

// Step 3: Calculate crash point using inverse transform
const RTP = 0.96;
const rawCrash = RTP / float;

// Step 4: Floor to 2 decimals, minimum 1.00
const result = Math.max(1.00, Math.floor(rawCrash * 100) / 100);

How It Works

  1. Generate float - Combine seeds into a hash and extract a random float between 0 and 1
  2. Inverse transform - Divide the RTP (0.96) by the float. This creates a distribution where:
    • Small floats → High multipliers (rare)
    • Large floats → Low multipliers (common)
    • Float ≥ 0.96 → Crash ≤ 1.00 (instant crash)
  3. Apply floor and minimum - The raw crash is floored to 2 decimal places, with a minimum of 1.00x

The Math Behind It

The crash point formula 0.96 / float creates a specific probability distribution:

  • 4% chance of instant crash (1.00x) - when float ≥ 0.96
  • 48% chance of 2x or higher - when float < 0.48
  • 9.6% chance of 10x or higher - when float < 0.096
  • 0.96% chance of 100x or higher - when float < 0.0096

This gives the house a 4% edge, which is the difference between 100% and the 96% RTP.

Example

Given these inputs:

  • Server Seed: c5e7146c5863d7d647c93ffe7d4ec13fffbb7311108fab0c067d97bcc2b32d55
  • Client Seed: LuckyClientSeed777
  • Nonce: 2

The hash produces bytes: [137, 90, 202, 182] (hex: 89 5a ca b6)

float = 137/256 + 90/256² + 202/256³ + 182/256⁴
      = 0.5351563 + 0.001373 + 0.000012 + 0.000000004
      = 0.5365416235

rawCrash = 0.96 / 0.5365416235
         = 1.789237

result = floor(1.789237 × 100) / 100
       = floor(178.9237) / 100
       = 178 / 100
       = 1.78

The crash point is 1.78x.

For an instant crash scenario (float ≥ 0.96):

float = 0.97

rawCrash = 0.96 / 0.97 = 0.989...

result = max(1.00, floor(0.989 × 100) / 100)
       = max(1.00, 0.98)
       = 1.00

The crash point is 1.00x (instant crash).

Verify your bets by selecting the "My Bets" tab at the bottom of the page while playing, then click on the bet you want to verify. For older bets, find them in your Bet History.

    CashierHomeGamesChat
    OPDUEL