Are you going to replace a room with a credits room, and have like a chest in it?
You should make it like the original Link to the Past, where instead of the first hidden dungeon you go to, there's a room where this guy won a NintendoPower Contest along with rupees. One last question, if this is going to be a MMO, then is there going to be 500 loving links running around, or can the player node be changed, much like in Garry's Mod?