The climb is the player's
A round opens at 1.00× and moves only when the page is turned. The next rung is on screen before it is bought, so the decision is made with the number in view.
Crashbook
Turn the page, catch the win
Crashbook is a crash game played out of a book. A round opens at 1.00×, every page the player turns adds to the multiplier, and it ends the moment they cash out — or the moment the page burns. No shared timer, no round to catch: the climb belongs to whoever is holding the book.
About the game
A crash game that waits for the player
Crash is a format defined by one decision — take what is on the table, or wait for more — and almost every crash game asks it against a clock that belongs to everybody at once. Crashbook takes the clock away. The round opens at 1.00× and stands still until the player turns the page; each turn adds between 0.05 and 0.14 to the multiplier, and the next rung is shown before they commit to it. The tension is the same, but the pace is theirs.
The outcome is not. Where the round burns is drawn when the stake is taken, from a distribution in which the chance of reaching any given multiplier is essentially the reciprocal of that multiplier. Turning a page draws no randomness at all — it compares the next rung against a crash point that was already settled — so the round can be verified afterwards rather than trusted at the time, and every settled round publishes a token that does exactly that.
Above it sits a jackpot that belongs to the operator's players rather than to the studio. A tenth of a percent of every stake feeds one pool, win or lose, and a round whose climb lands exactly on 50× rolls a fifty-slot reel for the whole of it — about one round in 2,582. Nothing else is held back: the pool is returned to players in full, and it is counted inside the 97% return rather than on top of it.
The mathematics is not asserted, it is derived. Our audit recomputes the crash distribution, the ladder, the payout arithmetic and the jackpot reel from the published configuration without importing a line of the engine, then plays 12,650,000 rounds through the engine itself and compares the three. The derivation lands at 97.01%, the simulation at 97.11%, against a 97.00% target.
The mathematics
What the game is set to pay
Derived independently of the engine, then measured against it. The audit that produced these figures is reproducible in the game's own repository.
Return to player
97.00%
Target · derived 97.01% · 12.65M rounds simulated
Multiplier range
1.01× – 300×
Floor clamp to ceiling
Page turn
+0.05 – 0.14
Drawn when the turn is taken
Jackpot
Pooled, rolled at 50×
0.10% of every stake · one roll in fifty
Round
Player-paced
No shared timer, no round to catch
Randomness
Kernel CSPRNG
Nothing on a money path uses Math.random
In-house audit, not a test-house certificate. Stake limits, payout caps and the opening value of a jackpot pool are set by the operator and sit outside the audited mathematics — we will walk you and your certification body through both.
Features
What Crashbook brings to a lobby
What the title gives a lobby, and what it asks of the platform behind it.
Cash out, or turn again
Two buttons and one question, answered in about a second. Short rounds that resolve the instant the player acts, and invite the next one.
A jackpot on a single rung
Every stake feeds one pool per operator. A climb that lands exactly on 50× rolls for the lot — roughly one round in 2,582 — without touching how that round itself settles.
Mathematics you can check
77 checks, an independent closed-form derivation and 12,650,000 simulated rounds, regenerated from scratch by one command in the game's own repository.
Built for imperfect connections
Rounds are keyed and settled once. A dropped socket, a reload or a duplicate tap resumes the round that was paid for rather than buying another.
Seamless wallet, four ways in
One ledger behind a REST seamless wallet, a flat bet/win/rollback interface, SoftGaming and GAP — with a launch hub that hands the session to the game.
Game preview
A look at the game
Captured from the live build — the same one the demo above opens.
Ready to bring Crashbook to your platform?
Play the demo, then talk to our team about integration, stake limits and the jackpot configuration on your side.