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How it worksWhat it paysRTPTest vectorsVerify

Provably Fair

  • How it works
  • What it pays
  • RTP
  • Test vectors
  • Verify
Provably FairTower

Tower

Each floor has its own number, which places the safe tiles on that floor; every placement is equally likely. You climb when the tile you pick is one of them.

RTP
98%
Max win
1.63M×
Verify a Tower roundPlay Tower
How it works

How a Tower result is made.

  1. 1

    Commit

    We choose our server seed before you bet and show its fingerprint. This commits us to that seed.

  2. 2

    The draw

    Your seeds place the safe tiles on each floor. You climb when your chosen tile is one of them.

  3. 3

    Reveal

    Rotate your seed to reveal ours. Use both seeds and the bet number to recheck any past result.

The whole formula

result = HMAC-SHA256(serverSeed, clientSeed:nonce:round)

  • serverSeedOur seed, sealed until you rotate
  • clientSeedYour seed
  • nonceBet number, +1 each bet
  • roundExtra numbers, for games that need more
tower.tsTypeScript
1export function generateTowerRow(float: number, columns: number, safeTileCount: number): { safeTiles: number[]; failTiles: number[] } {
2  // Uniformly choose which columns are safe. Every C(columns, safeTileCount)
3  // layout is equally likely, so each column is safe with probability
4  // safeTileCount / columns exactly (the v1 LCG shuffle was biased).
5  const safeTiles = uniformCombinationFromFloat(float, columns, safeTileCount);
6  const safeSet = new Set(safeTiles);
What it pays

Every outcome and what it pays.

Difficulty
Easy · 3 safe of 4 tiles
Floors clearedChance to get therePaysRTP
175.00%1.31×97.99%
256.25%1.71×96.03%
342.19%2.23×94.11%
431.64%2.91×92.22%
523.73%3.81×90.38%
617.80%4.98×88.57%
713.35%6.5×86.8%
810.01%8.5×85.06%
97.51%11.1×83.36%
RTP

Return to player.

Theoretical RTP: 98%.

  1. Each floor pays its fair multiplier × 0.98.

    multiplier = 0.98 × tiles ÷ safe tiles
  2. Your chance of getting through a step is exactly 1 ÷ its fair multiplier, so each floor returns 98% of its stake on average.

Test vectors

Fixed inputs, known results.

Reproduce these results with the inputs below.

Verify

Check a Tower round.

Find it in your bet history or on any bet slip

What we check

  1. 01Our seed matches its fingerprint
  2. 02Your seed is mixed in
  3. 03Numbers are drawn
  4. 04Numbers become the result
  5. 05The result matches your bet

Everything is calculated in your browser.

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