From Wikipedia: The gameplay focuses on completing goals given by talking to characters within each level. While some goals involve gaining a certain number of points in a specific time, many of the goals involve doing tricks on and off of pieces of the environment (for example: one level asks the player to grind three traffic lights, each one placed at a larger distance and facing a different direction). Another innovative feature focused on a player leveling system where the player would perform better in different areas of skating skill by practicing them repeatedly. For instance, if the player does many air tricks throughout the course of the game, each successful trick would create points in the player's air trick statistics. When the points reach a certain number, the player's air tricks will move up a level, making it easier to perform air tricks faster and more efficiently. The same actions apply to grinding, speed, wall riding, skating backward, etc.