The roulette wheel consists of 37 or 38 numbered pockets with alternating red and black backgrounds, plus one or two green zero sectors. The ball is launched along the outer rim in the opposite direction to the spin. It loses momentum, drops, and rests in one pocket. That pocket is the winning outcome.
The roulette table layout mirrors every number and colour on the wheel. It divides the betting surface into inside bets on specific numbers and outside bets on broad statistical categories. Number order on the wheel is deliberately non-sequential: reds and blacks alternate, and high and low numbers are spread around the rim so that no physical section of the wheel is dominated by a single betting category.
![Roulette table diagram showing inside and outside bets, the wheel and the racetrack]
Caption: roulette game layout, showing the position of the wheel, the numbered grid, inside bets, outside bets and the call-bet racetrack.
Purpose: helps you visually match the betting zones on the table to the sectors on the wheel before play begins.
Accessible element list: 1. Numbered grid (0 to 36, plus 00); 2. Inside bet zones; 3. Outside bet zones (dozens, columns, red/black, odd/even, high/low); 4. Racetrack for call bets; 5. Chip denomination selector.