Rugrats: Scavenger Hunt

Rugrats: Scavenger Hunt is a party game that was developed by Realtime Associates for THQ, and released on the Nintendo 64, on June 29, 1999; as its name suggests, it is the fifth title in the Rugrats series (and the second featuring multiplayer capabilities). The game was later released under the title Rugrats: Treasure Hunt in the EU on August 10, 1999 - however, only the title screen was changed to account for the new name, and the rest of the game remained the same as the original US version.

Story
This is taken from the back of the game's box, the front of which is displayed in the image to the right: