Games · Roulette
Roulette: place your bets
Place chips on any combination — single numbers, red/black, odd/even, dozens, columns — and spin. The combined house edge updates live as you build your bet, and the engine settles every chip together. Switch between the European and American wheels to see exactly what that second zero costs you.
Educational simulation — fun credits only, no real money. The house edge is real: the longer you play, the more the math wins.
Build your bet
- No bets yet — add one above, or place chips on the Play felt and they'll appear here.
↳ Carried over from the felt — set the spins and run.
Educational simulation — fun credits only, no real money. The observed edge wobbles over a short run, but converges to the exact house edge as the spins pile up. That convergence is the whole game.
Same bets, same payouts — but the American wheel's extra 00 pocket nearly doubles the house edge on every bet. Where you place the chip changes the swings, not the edge.
| Bet | Numbers | Pays | European edge | American edge |
|---|---|---|---|---|
| Straight upa single number | 1 | 35:1 | ||
| Split2 numbers | 2 | 17:1 | ||
| Street3 numbers | 3 | 11:1 | ||
| Corner4 numbers | 4 | 8:1 | ||
| Six line6 numbers | 6 | 5:1 | ||
| Column / Dozen12 numbers | 12 | 2:1 | ||
| Even-moneyred/black · odd/even · 1–18/19–36 | 18 | 1:1 | ||
| Top line ⚠️0-00-1-2-3 · American only | 5 | 6:1 | — |
How this simulation works
- Rules modeled
- Single-zero (European, 37 pockets) and double-zero (American, 38) wheels with standard payouts — straight 35:1, split 17:1, street 11:1, corner 8:1, six-line 5:1, top line 6:1, column/dozen 2:1, even-money 1:1. Place any combination; every placement settles independently each spin. No La Partage / En Prison.
- Assumptions
- Each spin is independent and uniform over the wheel's pockets (a seeded PRNG). Fun credits only — no real money. The 'house edge' shown for your bet is the stake-weighted combined edge; combining bets changes the variance, not the edge.
- Mathematical basis
- Odds and edges come from the analytic solver (house edge = (N − w·(payout+1)) ÷ N), the displayed source of truth; the spin uses the same engine. Reference edges: European 2.70% (1/37), American 5.26% (2/38), American top line 7.89% (3/38).
- Engine version
- roulette engine 1.0
- Validation
- Unit-tested (every bet's edge, the top-line special case, exact combination distributions, seeded reproducibility, 100k-spin convergence, settlement, validation).
- Last reviewed
- Independently reviewed for math and code correctness; every reported finding was addressed and regression-tested. Last reviewed 2026-06-23 (3 review passes).