 Most of the levels were modeled closely after real-world locations; the designers traveled to locales representative of each city in the game and took photographs and videos as reference.Neversoft wanted the player to become familiar with the basic game mechanics quickly and to notice "Underground"s differences from previous "Tony Hawk's" titles, who all stuck to roughly the same pattern, immediately.To accomplish this, they introduced the player to foot travel and the ability to climb along ledges in the first few missions of the game.