Chain of Memories KH CoM Reward Cards?

How do you get the first one? I just played it to the second floor but I still couldn't find the first floor's reward card.

 

They are a pain in the butt to get.

You really don't find too many of them until the higher floors, and you can only carry one at a time. I didn't bother with them until I got to the thirteenth floor, because nothing really drops them until then.

Once I was there, I fought monsters until they dropped one, warped to the first floor, opened the door... and repeated for the rest of them. Very time consuming... :p

 

Pure luck. You will eventually find one while battling a swarm of Heartless. Pick it up during the battle and use it on special doors to unlock cards un-obtainable anywhere else. Keep in mind that yopu can carry only one Key to Rewards card at a time. You must use the Key to Rewards card in order to have a chance to obtain another one.