I don't think that people really torrent game shows that much. I mean, I don't know what it is that qualifies a television program in Japan as a game show, as there aren't any 'real' contestants persay, and anyone competing for anything happens to be one of the normal talent that perform every night...
You're better off finding shows that feature musical guests, sometimes Mathew's Best hit TV, Hey Hey Hey!, Yaguchi Hitori, Bakushou Mondai (probably the closest thing to a game show), etcetera...
I'm away from my pc at home, maybe someone can provide some torrent links that host these types of programmes?