The event benefits Children's Miracle Network Hospitals.
The marathon takes place October 20th, but the Yakima team is looking for more gamers and sponsors right now.
If you're interested in participating, go to www.extra-life.org and register.
Look for the team "Extra Life Yakima" when signing up.
And you can ask your family and friends to sponsor you.
The fun part?
On the day of the marathon, October 20th, you can play any video game in your own living room, for 24 hours.
Donate at: www.extra-life.org/participant/Yakima