Sly Cooper and the Thievius Raccoonus

Sly Cooper and the Thievius Raccoonus is a stealth-platformer developed by Sucker Punch Productions and published by Sony Computer Entertainment. Released in 2002 for the PlayStation 2, the game follows Sly Cooper, a skilled raccoon thief, as he and his gang attempt to recover the Thievius Raccoonus, a book containing the secrets of his family's thieving legacy. The gameplay combines stealth, platforming, puzzle-solving, and light combat, and is noted for its cel-shaded visuals and humorous narrative.

This game is divided into five worlds, each themed around a particular part of the world and the villain headquartered there. Most worlds are structured as a central hub with entrances to numerous individual levels. Each of the levels has a primary goals which earns the player a key. You must collect all the keys in the world to fight the world's boss.