The game is based on the popular manga series Doraemon. It tells the story of a Japanese boy named Nobita, who often gets beaten by other boys. Nobita's future grandson constructs a cat-like blue robot named Doraemon, and sends him to the past to protect Nobita. In this game, a friend of Nobita's finds a fossil. Accidentally, this fossil gets overrun by a car. Nobita feels it was his fault and asks Doraemon to use a time machine to travel back to prehistoric age to retrieve the fossil.
Doraemon 3: Nobita to Toki no Hōgyoku is an action platform game. You can control Doraemon, Nobita, and other characters, traveling through platform levels, defeating or avoiding enemies. Each character has his own weapon and possesses a special ability (for example, Suneo can crawl through narrow spaces, etc.) which is often required to complete a stage. In present time, you travel through Nobita's town in top down view, talking to characters and entering houses. There is also a slight RPG element in the game, as you can buy items and upgrade your weapons.