Each group has a bucket for collecting the money; typically groups collect coins, but dollar bills may also be accepted. The value of any pennies collected by a group count toward that group's point total, while the value of other coins or dollar bills are subtracted. Hence, in a competition between Group A and Group B, a contributor who wants Group A to win will place pennies into Group A's bucket and nickels, dimes, quarters, or dollar bills into Group B's bucket.
In recent years the event dubbed as the penny war has been altered in several cases, with one potential replacement being the "change challenge."
- "Penny Wars Instructions" (PDF). Wildlife Medical Clinic - University of Illinois College of Veterinary Medicine.
- "Middle School 'penny war' raises more than $2,000 for cancer patient". Cass County Star Gazette. 2018-04-18. Retrieved 2018-04-25.
- "How to Conduct a Penny Fundraising Drive". www.pennies.org. Retrieved 2018-04-25.
- 102, Community Contributor LaGrange School District. "Forest Road School Penny War Nets Over $2,100 for Leukemia & Lymphoma Society". chicagotribune.com. Retrieved 2018-04-25.
- "Medomak Valley Honor Society raises funds to help ailing teacher - Knox VillageSoup". Retrieved 2018-04-25.