Go click on your profile from destiny, and scroll down to find your halo characters. Click on halo 3, then you'll go to the overview page. Click on halo 3 from the tabs, and you'll see your kill count. What did you have the most kills with? I played like 1,500 custom games and only 300 social/ranked matches. I had melee and BR as my top 2 in social/ranked. I think this was kind of cool! My favorite was SWAT games and Griffball!