Keno

Ten numbers from your seeds draw ten of the 40 balls, with no ball drawn twice. You are paid on how many of your picks were drawn.

RTP: 98.65–99.07%
Max win: 1,000×

Verify a Keno bet Play Keno

How it works

How a Keno result is made.

Commit
We choose our server seed before you bet and show its fingerprint. This commits us to that seed.
The draw
Your seeds draw ten different balls from 40. The matches with your picks determine the payout.
Reveal
Rotate your seed to reveal ours. Use both seeds and the bet number to recheck any past result.

The whole formula

serverSeedOur seed, sealed until you rotate
clientSeedYour seed
nonceBet number, +1 each bet
roundExtra numbers, for games that need more

keno.tsTypeScript

1export function computeKenoDrawsFromFloats(floats: number[]): number[] {
2  const numbers = Array.from({ length: KENO_BOARD_SIZE }, (_, index) => index + 1);
3  let floatIndex = 0;
4 
5  for (let index = KENO_BOARD_SIZE - 1; index >= KENO_BOARD_SIZE - KENO_DRAW_COUNT; index -= 1) {
6    const float = floats[floatIndex] ?? 0;

What it pays

Every outcome and what it pays.

Risk

Classic risk
Hits	1 pick	2 picks	3 picks	4 picks	5 picks	6 picks	7 picks	8 picks	9 picks	10 picks
0	0×	0×	0×	0×	0×	0×	0×	0×	0×	0×
1	3.96×	1.9×	1×	0.8×	0.25×	0×	0×	0×	0×	0×
2	—	4.5×	3.1×	1.8×	1.4×	1×	0.47×	0×	0×	0×
3	—	—	10.4×	5×	4.1×	3.68×	3×	2.2×	1.55×	1.4×
4	—	—	—	22.5×	16.5×	7×	4.5×	4×	3×	2.25×
5	—	—	—	—	36×	16.5×	14×	13×	8×	4.5×
6	—	—	—	—	—	40×	31×	22×	15×	8×
7	—	—	—	—	—	—	60×	55×	44×	17×
8	—	—	—	—	—	—	—	70×	60×	50×
9	—	—	—	—	—	—	—	—	85×	80×
10	—	—	—	—	—	—	—	—	—	100×

RTP

Return to player.

Theoretical RTP: 98.65–99.07%.

With p picks, the chance that exactly h of them are among the 10 drawn is:
P(h) = C(p, h) × C(40 − p, 10 − h) / C(40, 10)
Return is the sum over hits of chance times what that many hits pays.
RTP = Σ P(h) × pays(h)

Test vectors

Fixed inputs, known results.

Reproduce these results with the inputs below.

Verify

Check a Keno bet.

1export function computeKenoDrawsFromFloats(floats: number[]): number[] { 2 const numbers = Array.from({ length: KENO_BOARD_SIZE }, (_, index) => index + 1); 3 let floatIndex = 0; 4 5 for (let index = KENO_BOARD_SIZE - 1; index >= KENO_BOARD_SIZE - KENO_DRAW_COUNT; index -= 1) { 6 const float = floats[floatIndex] ?? 0;

Classic risk

Hits

1 pick

2 picks

3 picks

4 picks

5 picks

6 picks

7 picks

8 picks

9 picks

10 picks

0×

3.96×

1.9×

1×

0.8×

0.25×

0×

—

4.5×

3.1×

1.8×

1.4×

1×

0.47×

0×

—

10.4×

5×

4.1×

3.68×

3×

2.2×

1.55×

1.4×

—

22.5×

16.5×

7×

4.5×

4×

3×

2.25×

—

36×

16.5×

14×

13×

8×

4.5×

—

40×

31×

22×

15×

8×

—

60×

55×

44×

17×

—

70×

60×

50×

—

85×

80×

—

100×

How a Keno result is made.

Commit

The draw

Reveal

The whole formula

Every outcome and what it pays.

Return to player.

Fixed inputs, known results.

Vector 1Drew 2, 6, 12, 13, 16, 19, 23, 29, 35, 37. 0 of 5 picks hit: pays 0.00×.

Vector 2Drew 6, 12, 15, 18, 20, 23, 26, 33, 34, 37. 2 of 10 picks hit (20, 23): pays 0.00×.

Vector 3Drew 5, 6, 7, 9, 20, 23, 24, 36, 39, 40. 1 of 2 picks hit (7): pays 0.00×.

Check a Keno bet.

How a Keno result is made.

Commit

The draw

Reveal

The whole formula

Every outcome and what it pays.

Return to player.

Fixed inputs, known results.

Vector 1Drew 2, 6, 12, 13, 16, 19, 23, 29, 35, 37. 0 of 5 picks hit: pays 0.00×.

Vector 2Drew 6, 12, 15, 18, 20, 23, 26, 33, 34, 37. 2 of 10 picks hit (20, 23): pays 0.00×.

Vector 3Drew 5, 6, 7, 9, 20, 23, 24, 36, 39, 40. 1 of 2 picks hit (7): pays 0.00×.

Check a Keno bet.