How crash games work: the multiplier, the RTP and “provably fair”

The basic round

Crash games replace reels with a single rising number. Spribe, the studio behind Aviator, describes its game as an increasing curve that can crash at any time: the multiplier starts growing when the round begins and the player must cash out before the plane flies away. Rocket, balloon and chart-themed versions from other studios work the same way.

Many versions are multiplayer. Everyone in the round sees the same curve and the other players’ cash-outs, which adds social pressure but has no effect on the result.

The odds at each cash-out point

Suppose a game returns 97% whichever target you choose. Your expected return is the chance of reaching the target multiplied by the target, so that chance must be 0.97 divided by the multiplier.

A 2x target is not a coin flip; it loses slightly more often than it wins, and that gap is the 3% edge. The same edge sits inside every other row. Low targets feel safe and high targets feel lucrative, but each costs the same per unit staked.

Why strategies do not help

• Rounds are independent. A run of early crashes does not make a long round more likely.
• Doubling the stake after a loss is the Martingale system; it fails here for the same reason it fails at roulette.
• Two bets per round with different targets is two bets, each with the same edge.
• “Predictor” apps and signal channels cannot know the result before it is generated. They are a common route to fraud.

What “provably fair” proves

Some crash games publish a cryptographic commitment, a hash, before each round and reveal the underlying value afterwards. Players can check that the revealed value matches the commitment and that the crash point was derived from it. That shows the result was fixed before bets were placed and was not altered in response to them.

It does not show that the game is generous, that the stated RTP is accurate over time, or that the operator will pay. Those depend on testing and on the operator’s licence. A provably fair game on an unlicensed site is still an unlicensed site; check the licence.

Plinko, mines and other instant games

Plinko-style games drop a ball through pegs into multiplier slots; mines-style games reveal tiles on a grid. They share the crash format’s traits: one simple decision, a published RTP that is often high, and very short rounds. BGaming, for example, publishes 99% for its Plinko.

High RTP and high speed pull in opposite directions. A 1% edge on 30 bets a minute can cost more per hour than a 4% edge on a slot spun ten times a minute. Published figures for individual titles are on our crash and instant games pages.