Line Rider is an iPhone game that lets you create and design your own sledding course. With multiple riders, audio import, and new features, this classic sandbox game has become even more addictive. The game allows you to scrub through the timeline to go to any point in time, pause in the middle of the track, and see live physics updates as you draw. You can visualize the trajectory of the sledder with onion skin and move, adjust, and copy lines with the select tool.

The game's simple controls and intuitive interface make it easy for anyone to start creating their own tracks. The ability to import audio and customize the riders adds a personal touch to the game. Overall, Line Rider is a fun and creative game that offers endless possibilities for designing your own sledding course.