Since hiding and finding is a common interest in small children this will be a great indoor/outdoor game. There are different variations of the games. Sometimes you cant to twenty, sometimes to ten, sometimes too one hundred or multiples of fives. Sometimes there is a home base that you can run to and tag so that you are "SAFE", or just wait and see if you are found.
The idea is that one person is "it," that person closes his or her eyes and counts to a certain number without looking and then he or she tries to find the others.
Number of People: 2 or more
Supplies: Good hiding spaces.