Yes, you can play roulette alone. In fact, many players prefer to play roulette alone, especially when playing online or at a self-serve electronic roulette table.
When playing roulette alone, you can choose your own numbers and place your bets without any other players or distractions. This can be a good option for players who prefer a more focused and solitary gaming experience.
However, if you're playing at a physical roulette table in a land-based casino, you may still be surrounded by other players, even if you're the only one placing bets on your own.