REGISTER TO REMOVE ADS
As Badger has stated, you have to receive the Key to Rewards card first before entering these rooms. They are randomly dropped at the end of battles. I believe you can only start receiving these rare cards after you complete your first group of World cards. I hope this helps.How do you open up the gold room? How do you get the right card? I'm in the premium room right now in traverse town. I want to get the gold room before I move on.
I have played both versions of the game and as I recall, the rarity of the Key to Rewards is the same for both versions. It seems to be more common to get the card once one enters the higher floors of Castle of Oblivion.but yeah, this is for the GBA version