How crash games work

A crash game is a casino game built around one rising number. Each round a multiplier starts at 1.00x and climbs until it “crashes” at a random point. If you cash out before the crash, you win your stake times the multiplier at that moment. If the crash comes first, you lose the stake. That’s the whole game. Aviator, JetX, Spaceman and Space XY are all built on it. This guide explains what happens behind the scenes, how the odds work, and how you can check a round was fair.

A round, step by step

1. Betting window. You have a few seconds to place one bet, or two in dual-bet games, and optionally set an auto-cashout.
2. Take-off. The multiplier starts at 1.00x and rises, usually faster the higher it goes.
3. Cash out. Press cash out, or let auto-cashout trigger at your target. Your win is stake × multiplier.
4. Crash. At the pre-decided point the round ends. Bets still open are lost.
5. History. The crash point joins the round history bar, and the next betting window opens.

Where the crash point comes from

The crash point is fixed before the round starts. Typically:

1. A random value is generated. In provably fair games it comes from combining a hidden server seed, a client seed and a round number (the nonce) with a hash function.
2. That value becomes a uniform random number U between 0 and 1.
3. A formula turns U into a crash point. The standard form is crash = max(1, floor(100 × (1 − edge) ÷ (1 − U)) ÷ 100).

That formula produces lots of low crash points and a long tail of rare huge ones. It also produces an instant 1.00x crash in about edge% of rounds.

The odds

The chance that a round reaches multiplier x is approximately:

P(reach x) = RTP ÷ x

Target	Chance (97% RTP)	About 1 in
1.5x	64.7%	1.5
2x	48.5%	2.1
5x	19.4%	5.2
10x	9.7%	10.3
100x	0.97%	103

Multiply any chance by its payout and you get the RTP: 48.5% × 2 = 97%. The full list is in our multiplier probability table, and you can try any target in the calculator below.

RTP and house edge

RTP (return to player) is the long-run share of stakes paid back. House edge is the rest. A 97% RTP game keeps about 3 cents of every dollar wagered over time. Some games publish higher RTPs and some let casinos choose between settings. That’s why our game pages only show RTPs we’ve verified. More detail: Crash Game RTP and House Edge Explained.

Why the round history doesn’t help

The history bar shows recent crash points, and it’s tempting to see patterns: “three low ones, a big one is due”. Each round is independent, and the next crash point was fixed before you saw it. Runs and clusters are normal in random data. Apps that claim to predict rounds are scams. See Can You Predict Crash Games?.

Provably fair, in one paragraph

Many crash games publish a hash of the next server seed before the round. After the round they reveal the seed, so you can hash it yourself, confirm it matches, and recompute the crash point. If the operator had changed the result, the hash wouldn’t match. Learn how in Provably Fair Explained, or use our verifier.

Features you’ll see

• Auto-bet: repeats your bet automatically for a set number of rounds.
• Auto-cashout: cashes out at your target with no reaction delay.
• Dual bet: two independent bets per round.
• Live bets and chat: see other players’ cash-outs in real time.
• Rain: free bets dropped into the chat by the game or casino.

None of these change the odds. Our auto-bet and auto-cashout guide covers the settings worth using.

Where to go next

• Compare systems in Best Crash Game Strategies
• See how crash games compare with slots in Crash Games vs Slots
• Browse every crash game we review