They add up to four games every Monday to the VC. We have downloaded Mario Bros. and Super Mario 64 so far. I'm waiting for some other SNES games...something in the DK series would be nice. (DKC, DiddyKong Racing.)
What's irritating is that Japan already has a pretty good list of games available. But, Nintendo of America decided to put good games on the VC on months when there are few good Wii releases.
