Well, if I'm not wrong then we can also play BC.Poker directly by registering at its own site. I remember to play that poker on its own site in past instead of playing it directly at BC.GAME's site.
I can attest to that. I have registered on the main bcgame and was able to participate in some poker tournaments conducted before with bcpoker. I just used the same account of mine and didn't have to register to bcpoker because they share the same database. So both registration complements each other and a user can login his credentials to both websites.