Marco Polo with a twist using math problems to find your friends.
Any open space
The seeker keeps his or her eyes closed, and says a math problem.
The hiders need to answer the math problem correctly.
The seeker uses his or her voice to locate hiders, and tag one of them, making him or her "it". This means that the person caught becomes the seeker.
The hiders have 6 seconds to answer the math problem. If they answer incorrectly they are automatically it.
If there is more than one hider who answers incorrectly, the seeker chooses who is "it" next.
Close your eyes if you are "IT"
Yell out a math problem
Listen for the correct answer
Find the hiders
Tag one "it"
Hiders try to answer correctly