StepMania is a free, open-source rhythm video game that allows players to step on arrows in time with music. It is inspired by arcade games like Dance Dance Revolution and features a variety of songs and difficulty levels. Players can use dance pads or keyboard controls to hit the arrows as they appear on the screen. The game supports custom songs and charts, enabling users to create and share their own content. StepMania also includes multiplayer options and various game modes, making it a popular choice for rhythm game enthusiasts and communities around the world.