UP - Sony PSP Upgrade Russell's merit badges & complete Carl's adventure book, unlock content and upgrades when you collect them all. Explore 27 levels featuring jungles, caves, rock formations, Paradise Falls and Muntz's blimp while avoiding dangerous plants and animals along the trail. Compete in aerial dogfight combat, evade villainous dogs in dog chases, take part in large boss fights with exotic animals like Crocodiles, Anacondas & Jaguars and battle the villainous Muntz in the final level. Enjoy both single player and multiplayer co-op game support throughout the entire game via your PSP's ad hoc connection. Overcome obstacles & conquer the environment in the form of rock formations, dizzying heights, raging rivers and the weather. Upgrade Russell's merit badges & complete Carl's adventure book, unlock content and upgrades when you collect them all. Explore 27 levels featuring jungles, caves, rock formations, Paradise Falls and Muntz's blimp while avoiding dangerous plants and animals along the trail. Compete in aerial dogfight combat, evade villainous dogs in dog chases, take part in large boss fights with exotic animals like Crocodiles, Anacondas & Jaguars and battle the villainous Muntz in the final level. Enjoy both single player and multiplayer co-op game support throughout the entire game via your PSP's ad hoc connection. Overcome obstacles & conquer the environment in the form of rock formations, dizzying heights, raging rivers and the weather.