scavenger hunt

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A game in which individuals or teams try to locate and bring back miscellaneous items on a list.

Wiktionary

1. n. A game in which individuals or teams seek to find a number of specific items, or perform tasks, as given in a list.

GNU Webster's 1913

1. n. a game in which individuals or teams are given a list of items and must go out, gather them together without purchasing them, and bring them back; the first person or team to return with the complete list is the winner. The items are sometimes common but often of a humorous sort.