What is CS2 crash?
CS2 crash is a fast gambling game offered on skin gambling sites. You deposit skins or money into a site balance, place a bet, and watch a multiplier climb from 1.00x. At a hidden moment the round "crashes" and the multiplier stops. If you pressed cash out before that moment, you win your bet times the multiplier on screen. If you did not, you lose the bet.
The game has nothing to do with Counter-Strike itself. It is called CS2 crash because the sites take CS2 skins as deposits and pay out in skins or site credit. The skins are the currency, not the game.
Crash rounds last a few seconds to a minute, and a new one starts almost at once. That speed is a big part of why people find it hard to stop, and it is worth knowing before you start.
How does a crash round work?
A round has three stages. First there is a betting window, usually a short countdown, where you type a stake and optionally an auto cashout multiplier. Second, the multiplier starts rising. It grows faster the longer it runs, so 1.0x to 2.0x takes longer than 5.0x to 6.0x. Third, the round crashes at a point decided before the round began, and every bet that is still in play loses.
Cashing out is a single click. Whatever the multiplier shows at that instant is what you get, less any lag between your click and the server. Auto cashout removes the lag because the server cashes you out at the number you set.
Most sites show a list of the last crash points on the side of the screen. This list is there because people like to watch it. It has no bearing on the next round, and we come back to that below.
What is the house edge in crash?
The house edge is the share of all money bet that the site keeps over time. Crash builds its edge into the crash point itself. The simplest way to see it is with one formula.
If the house edge is h (written as a decimal, so 5% is 0.05), the chance that a round reaches at least a multiplier m is:
P(reach m) = (1 - h) / m
Read that as "one minus the edge, divided by the multiplier". At m = 2.0 with a 5% edge, the chance is 0.95 / 2 = 0.475, or 47.5%. At m = 10 it is 0.95 / 10 = 9.5%.
Now look at what that does to your expected return. If you always cash out at m, you win m times your stake with probability (1 - h) / m. Multiply those together and m cancels:
Expected return = m x (1 - h) / m = 1 - h
So with a 5% edge you get back 95 cents per dollar on average, no matter what multiplier you aim for. That is the whole story of crash strategy: there is no cashout point that beats the edge, only ones that lose faster or slower with bigger or smaller swings.
Many crash designs also add an instant crash. A share of rounds equal to h crashes at 1.00x, so nobody can cash out at all. That is one clean way to make the formula above hold.
Sites choose their own h and do not always publish it. Our house edge calculator lets you try different edges and see the long-run cost. For the general idea across all games, read house edge explained.
What is the chance of reaching each multiplier?
The table below uses a 5% house edge as an example. It is not the edge of any specific site. Real sites may use a lower or higher number, and a small change in h shifts every row.
| Cashout target | Chance to reach it (5% edge, example) | Rounds lost out of 100, on average | Expected return per $1 |
|---|---|---|---|
| 1.10x | 86.4% | 14 | $0.95 |
| 1.50x | 63.3% | 37 | $0.95 |
| 2.00x | 47.5% | 53 | $0.95 |
| 3.00x | 31.7% | 68 | $0.95 |
| 5.00x | 19.0% | 81 | $0.95 |
| 10.00x | 9.5% | 91 | $0.95 |
| 50.00x | 1.9% | 98 | $0.95 |
| 100.00x | 0.95% | 99 | $0.95 |
Notice two things. Even a "safe" 1.10x target loses about one round in seven. And the last column never changes. A 100x win looks huge, but it comes about once in 105 rounds, and the 104 losses in between pay for it and a bit more.
How does provably fair work for crash?
Provably fair is a way for a site to prove that the crash point was fixed before the round and was not changed after seeing your bet. Crash uses a slightly different setup from cases or roulette because rounds run one after another without a per-player bet before each one.
The common design works like this. The site generates a long chain of secret values, called hashes, where each value is made by hashing the next one. Rounds are played in reverse order down the chain. Before a round starts, the site shows you the hash of that round's secret value. After the round, it reveals the secret value. You can hash it yourself and check that it matches what was shown first, and you can also check that hashing it gives the previous round's value. This makes the whole history one connected chain that cannot be edited in the middle.
To stop the site from picking a friendly chain, most sites mix in a public seed that was chosen after the chain was built. This is often the hash of a Bitcoin block or a similar public value, or a client seed you set. The final crash point comes from combining the round's secret value with that public seed.
The last step turns the combined hash into a multiplier. In general terms, the hash is converted to a number between 0 and 1, then the multiplier is roughly (1 - h) divided by that number, with a floor at 1.00x. That is the same formula as the win-chance formula above, run backwards. A hash that gives a small number produces a big multiplier, and a hash that lands in the top h share of the range produces an instant crash.
You can check a revealed value against its published hash with our provably fair verifier. For the full method and its limits, read how provably fair works. Two limits matter here. Provably fair proves the crash point was not changed. It does not prove the edge is small, and it does not prove the site will pay you.
What are the common myths about crash?
Crash attracts more strategy talk than any other skin game. Almost all of it is wrong in the same way.
"It has crashed low five times, so a big one is due." Each round's crash point comes from its own hash. The last five results do not feed into the next one. A run of low crashes is normal and tells you nothing. This is the gambler's fallacy, and crash history bars are built to trigger it.
"Cash out at 1.5x every time and you win more than you lose." You do win more rounds than you lose at 1.5x. But you lose 37 rounds in 100 and win 63, and each win pays only half a stake. The expected return is still 1 - h. Winning often is not the same as winning money.
"Double your bet after every loss and you have to come out ahead." This is martingale. It works until a losing streak wipes out your balance or hits the site's maximum bet, and both happen sooner than people expect. At a 50% win rate, a run of 7 losses happens about once in 128 tries, and by then you are betting 64 times your first stake to win back one. The edge is still taken from every one of those bets.
"Watching the bets of other players tells you when it will crash." Other players cannot see the crash point either. Big players cashing out early does not change the hash.
"Auto cashout at a high number is free money because I only need one hit." See the 50x row above. You wait through about 98 losses for every hit, and the hit pays back 50, not 98.
How do you set limits before you play crash?
The speed of crash is the risk. A new round every 30 seconds means you can place 100 bets in under an hour without noticing.
Decide three numbers before you deposit. A deposit limit for the week, a loss amount at which you stop for the day, and a session length. Write them down where you will see them. If a site offers deposit limits, loss limits or a session timer in its settings, turn them on before the first bet, because turning them on later, when you are chasing, is much harder.
Treat any win as money to withdraw, not money to bet. The edge applies to every bet, so the longer money stays on the site, the more of it the site keeps on average.
If you find yourself betting to win back losses, betting more than you planned, or hiding how much you play, that is the point to stop and get help. Our responsible gaming page lists free and independent support services. Self-exclusion tools on the site itself can lock you out for a set time and are worth using early rather than late.
Crash is one of several games on these sites. If you want to understand the others, our hubs on coinflip and roulette use the same plain math.