Siliconera has pored through the ESRB online rating database again, and this time it looks like a couple of potential Xbox 360 Live Arcade releases have leaked. The database is listing Final Doom and Ultimate Doom as “M” rated titles for the Xbox 360. With Doom standing as one of the few Arcade titles with strong online play, it would seem to make sense to take advantage of all the extra content available from the franchise.