Would anyone like to save someone's life? While playing a 25 hour video game marathon?
Just sign up! http://www.extra-life.org/index.cfm? .

Then join team http://www.extra-life.org/index.cfm?fuseaction=donorDrive.team&teamID=10648

Then get donations! And play video games for 25 hours on Nov.2nd.2013. Even if you're busy on that day, you could still get donations, ask friends, family etc.

Couldn't I just give them a donation and not torture myself with 25 hours of video games?

How about 25 hours of sleeping.