You Are Describing a Roulette Wheel
The game with the spinning wheel, the small ball and the numbered holes is roulette. The holes are called pockets, the wheel spins in one direction while the ball travels in the other, and the round ends when the ball drops into one of the 37 or 38 pockets and settles there. Everything else on the table is built around that single event: players place bets on where the ball will land, the dealer closes betting, the wheel spins, and winning bets are paid while losing bets are cleared.
Roulette is a game of pure chance. No decision you make after the ball is released changes where it lands, and no decision before the release changes the underlying mathematics of the wheel. What you choose is which bets to place, and the choice matters because different bets on the same wheel carry different expected rates of loss.
The Object and the Table
The object is straightforward: predict which pocket the ball will land in, or which group of pockets it will land in. The table layout is a printed grid of numbers and betting areas that mirrors the wheel. You buy in at the table, receive coloured chips that are unique to you at that table, and place them on the layout. The dealer then spins the wheel, releases the ball, and announces when no more bets may be placed.
When the ball settles, the dealer marks the winning number on the layout, clears all losing chips, and pays winning bets according to the odds printed in the table rules. Your coloured chips are then exchanged back for standard casino chips at the cage or the table when you finish.
The Two Wheel Types and Why the Difference Matters
Roulette wheels come in two main layouts, and the difference is one pocket. A European wheel has 37 pockets numbered 0 to 36 with a single zero. An American wheel has 38 pockets with both a single zero and a double zero. The extra pocket is not a cosmetic difference: it changes the house edge on every bet on the layout.
Because a straight-up bet on a single number pays at odds calculated as if there were 36 possible outcomes, the presence of the zero pockets is where the operator's advantage comes from. The American wheel's additional double zero means the same bet loses at a faster expected rate on that layout than on the European one. The wheel type is printed on the table or shown on the electronic display, and it is the first thing to check before you buy in.
| Feature | European wheel | American wheel |
|---|---|---|
| Pockets | 37 | 38 |
| Zero pockets | Single zero only | Single zero and double zero |
| Number range | 0 to 36 | 0 to 36 plus 00 |
| Effect on house edge | Lower edge for the same bet | Higher edge for the same bet |
| Where to confirm | Table signage or game information panel | Table signage or game information panel |
How a Round Unfolds
A round moves through a fixed sequence. First, the dealer opens betting and players place chips on the layout. Second, the dealer spins the wheel and releases the ball in the opposite direction. Third, at a point during the spin the dealer announces that no more bets may be placed; after that call, chips cannot be moved or added. Fourth, the ball drops into a pocket and the dealer marks the winning number. Fifth, losing bets are cleared and winning bets are paid. The wheel then remains in place for the next round, and the sequence repeats.
The buy-in step has its own procedure. You place cash on the table rather than handing it directly to the dealer, and the dealer exchanges it for roulette chips in a colour assigned to you. These chips have no value away from that table, which is why you exchange them back before leaving. On electronic roulette terminals the same sequence runs automatically, and the machine tracks your balance instead of issuing coloured chips.
The Main Bet Types and Their Edges
Roulette bets fall into two broad families. Inside bets are placed on the numbered grid itself and cover single numbers or small groups of adjacent numbers. Outside bets sit around the perimeter of the layout and cover large categories such as red or black, odd or even, and high or low. The general relationship is that bets covering fewer numbers pay more when they win and lose more often, while bets covering many numbers pay less but hit more frequently.
What matters for the player is not just the payout but the house edge attached to each bet. On a given wheel, most standard bets carry the same edge because the zero pockets affect them all in the same way. The exception on some layouts is a group of outside bets that may be treated differently when the ball lands in zero; the table rules state whether the stake is lost, held, or split. The tie bet in baccarat carries a higher edge than the other two main bets, and craps tables show the same pattern: different bets on one table carry materially different edges. Roulette follows the same principle, so the exact terms printed at the table are the only reliable source for the edge on a specific bet.
| Bet type | What it covers | Payout structure | Edge relationship |
|---|---|---|---|
| Straight-up | One number | Highest payout, lowest hit frequency | Same base edge as most bets on that wheel |
| Split | Two adjacent numbers | Half the straight-up payout | Same base edge |
| Street | Three numbers in a row | Lower than split | Same base edge |
| Red or black | 18 numbers of one colour | Even-money payout | Same base edge, subject to zero rule |
| Odd or even | 18 numbers of one parity | Even-money payout | Same base edge, subject to zero rule |
What a Strategy Chart Can and Cannot Do
Roulette has no strategy chart in the sense that blackjack does. In blackjack, published basic-strategy charts derive from the specific rule set in use: deck count, dealer stand rules, doubling and splitting rules. Change one rule and the correct play on some hands changes with it. Roulette offers no such decision tree because there is no decision after the bet is placed. The only choices are which bets to make, how much to stake, and when to stop.
That does not make the choices trivial. Bet selection changes how often you win and how large the wins are, which changes the shape of a session even though it does not change the long-run expected loss on a given wheel. A player who wants frequent small outcomes chooses outside bets. A player who wants rare large outcomes chooses inside bets. Neither choice alters the house edge, and no betting pattern does.
Procedural Mistakes New Players Make
The first mistake is touching chips after the dealer has called no more bets. The call is binding, and a chip moved after it may be returned to its original position or treated as a losing bet depending on the table's procedure. The second is handing cash directly to the dealer instead of placing it on the table for the buy-in, which breaks the camera-visible transaction rule most venues follow. The third is leaving the table with coloured roulette chips still in hand; they have no cash value at the cage and must be exchanged at the table where they were issued.
A fourth mistake is assuming that a wheel that has landed on black several times in a row is now more likely to land on red. Each spin is an independent event on a wheel with the same pockets as the spin before. The wheel has no memory, and the odds on the next spin are the same as they were on the previous one.
FAQ
Is the game with balls and holes ever something other than roulette?
In a casino context the description almost always points to roulette, because the wheel, the bouncing ball and the numbered pockets are distinctive. Some carnival games and lottery-style draws also use balls and numbered holes, but on a casino floor the table with that description is roulette.
Does the number of pockets change how much a winning bet pays?
The payout for a given bet type is normally the same whether the wheel has 37 or 38 pockets. What changes is how often the bet wins relative to the payout, which is why the American layout carries a higher house edge than the European layout for the same bet.
Can I use a betting pattern to improve my odds at roulette?
No betting pattern changes the built-in edge of the wheel. Systems that double a stake after a loss or raise it after a win redistribute when wins and losses land, but they do not change the expected rate of loss, and they increase the size of the swings you experience.
Gambling can be addictive. If you or someone you know is struggling, call the helpline printed in the footer below for confidential support, or visit www.ncpgambling.org. Please play responsibly and only with money you can afford to lose.
Play responsibly
Gambling should be treated as paid entertainment, never as a way to earn income or recover losses. 1-800-MY-RESET (1-800-697-3738)
18+ or 21+ depending on where you are; follow the minimum age that applies to you.
This article is general information about how these mechanics work. It is not legal advice and not a recommendation to gamble or to use any particular operator. Availability and legality differ by jurisdiction — check the rules that apply where you are.