SONAR

Place your bet before the round starts. A multiplier rises from 1.00× and can crash at any point. Press ▲ SURFACE to cash out before the crash — your winnings are your stake × the multiplier at cashout.

If you don't cash out before the crash, your stake is lost.

Set a target multiplier in the AUTO box. If the round reaches that value before crashing, you are automatically cashed out at exactly that multiplier.

Theoretical RTP is 96%. The house edge is 4%, applied via the crash-point formula. Over a large number of rounds, the expected return on each $1.00 wagered is $0.96.

Every crash point is determined before the round starts using HMAC-SHA256 of a server seed and client seed. The server seed hash is shown before the round; the seed is revealed after its chain rotates (every 1,000 rounds). Use the ▤ HISTORY panel to verify any past round.

SONAR Crash  v1.0.0
Operated by Sonarwise Ltd.  |  RNG: Provably Fair HMAC-SHA256

Gambling should be entertainment, not a way to make money. Never chase losses. Only play with money you can afford to lose. Take regular breaks — the game will show a Reality Check every 25 rounds.

Deposit limits, loss limits, session time limits, and self-exclusion are available. Contact our support team to configure account-level protections:

Email: hello@sonarwise.com
Subject: Responsible Gaming — Account Limits

If gambling is affecting you or someone you know, free confidential support is available:

GamCare (UK): 0808 8020 133  |  gamcare.org.uk
BeGambleAware: begambleaware.org
Gamblers Anonymous: gamblersanonymous.org
National Problem Gambling Helpline (US): 1-800-522-4700

You may request to be excluded from play for a defined period (minimum 6 months). Email hello@sonarwise.com with subject Self-Exclusion Request. Exclusions take effect within 24 hours.

Enter a Round ID to fetch its seed data, then verify the crash point independently.

1. Get serverSeed, clientSeed, and nonce from round data above.
2. Compute: HMAC-SHA256(serverSeed, clientSeed + ":" + nonce)
3. Take the first 13 hex chars → divide by 0x10000000000000.
4. Crash = floor(min(5000, 0.96 / (1 − h)) × 100) / 100
Server seed is revealed only after the 1,000-round seed chain rotates.