Line Rider is a simple online game that allows players to create and manipulate a virtual landscape using a drawing tool. Players can draw lines on a blank canvas, which serve as tracks for a small sledder character to ride on. The objective is to create interesting and fun paths for the sledder to navigate, often resulting in creative and sometimes complex designs. The game features a physics engine that simulates gravity and momentum, making the sledder react realistically to the drawn lines. Players can share their creations with others, leading to a community of enthusiasts who enjoy showcasing their unique tracks and challenges.