European single-zero roulette (house edge −2.70%). Place chips, spin, and see the Martingale system fail under the law of large numbers.
Hot / cold numbers appear after 10 more spins.
Pick a chip, click a betting area, then SPIN. Refill your balance with Reset.
Inside bets: click a grid border = Split (17:1), an intersection = Corner (8:1), the row below the grid = Street (11:1) / Line (5:1).
What is the Martingale system?
Double your bet after every loss on an even-money wager. In theory a single win recovers all prior losses plus one base unit of profit.
In reality (1) the table maximum and (2) a finite bankroll mean a long losing streak wipes you out.
Configure the run below and press "Run simulation" to see, on a European wheel (green 0, EV −2.70%), how often the strategy busts.
Flat-bet one unit on the chosen bet, every spin. Early on the empirical return swings wildly, but the law of large numbers drags it toward the theoretical −2.70% — no matter which bet you pick.
This is why "systems" don't work: the edge is baked into every wager equally.