Apparently there were 40 or so games for Genesis and TG16 locked on the Dream Passport 3 discs in Japan as part of the Dream Library download service. I've heard of the DP3 being hacked before and being distributed with hundreds of Genesis ROM's but what I'm really curious to see is the DP3 disc "unlocked" to play just those 40 or so Genesis and TG16 games.
Also, So far I haven't found a solid list of what the 40 (I think it was 43?) games were. This site has a list of 30 of them...
http://www.giantbomb.com/dream-library/92-2296/
...has anyone found a more thorough list?