Pick a layout and spin. Every pocket is equally likely on every spin — the only thing that changes between wheels is how many green pockets dilute your bets.
One wheel, three edges
Every pocket on a fair wheel is equally likely: 1 in 37 on the European layout, 1 in 38 on the American, 1 in 39 on triple-zero. Payouts never move — a straight number pays 35:1 on all three — so each extra zero is pure, added house edge: 2.70%, 5.26%, 7.69%.
Nothing about past spins changes the next pocket. Trackers, hot numbers and due colors read patterns into independence; the simulator shows what that independence actually produces.
Methodology
Each spin draws one pocket uniformly via random_int (CSPRNG) from the layout's pocket list: 0–36, plus 00 on the American wheel and 000 on triple-zero. Colors follow the standard layout; the even-money edge equals zeros divided by pockets.
Pockets, payouts and where the edge hides
A wheel's edge is pure bookkeeping: the payout is calculated as if the zeros did not exist. A straight-up number pays 35 to 1 against 36 non-winning pockets on a European wheel, so the house keeps 1/37 of every stake — 2.70%. Add the double zero and it keeps 2/38, or 5.26%, with no change to any payout on the table.
The simulator makes that visible by letting you change pocket count while holding the payouts fixed. Watch the expected-loss line steepen as pockets are added, and notice that the individual session paths barely change shape. That is the whole business: the edge is invisible in any one evening and inevitable across thousands of them.
FAQ
What does the simulator actually show?
How a fixed house edge produces wildly different sessions. Run the same settings twice and the paths diverge completely while the expected loss — edge × total staked — stays identical.
Why does my balance sometimes grow for a long stretch?
Because variance dominates short runs. Over a few hundred spins the swing around the expected line is larger than the line itself, which is why a good night proves nothing about a game.
Does the number of pockets change the edge?
Yes, directly: the edge is the share of pockets that pay nothing. Each added zero takes another slice of every payout without changing the odds printed on the table.
Can I use this to test a system?
You can watch a system's shape — how often it wins small and how badly it loses — but not improve on the expectation. No sequence of bets changes the per-spin edge.