To start the reels spinning, players would pull a lever; if they lined up in a winning combination, they would be paid out in coins. This innovation captivated players with its simplicity & the excisolo slotstement of chance, laying the foundation for what would grow into a multibillion dollar industry. Slot machine technology changed dramatically as Las Vegas became the global center of gambling in the middle of the 20th century. A major turning point was the invention of electromechanical slots in the 1960s, which made it possible to add lights and sounds to the game and play more intricately.