Apatosaurus appears as one of the 20 dinosaurs that are featured in the game. It only appears physically in "Gyrosphere Valley" where several are seen in the Gyrosphere attraction. It is also the sauropod skeleton seen in the Visitor Center in the Jurassic Park levels of the game.
The amber of Apatosaurus is found in the level "Commuications Center" and collecting the bone boxes of that level unlocks the skeleton skin for Apatosaurus. As a playable dinosaur, it can stomp on the ground to break objects like Brachiosaurus.