 Kingdom Hearts : Chain of Memories is a combination between a role @-@ playing video game and collectible card game . The main role @-@ playing aspect is an experience point system that is used to increase the character 's maximum health or Card Points , or to learn a new skill . The cards are utilized in the progression of the story as well as in combat . The game features a field map and battle screen . The field map is an isometric area where the player can traverse between rooms . Enemies inhabit the field map and track the player to engage in combat , which can be initiated through contact between the player and an enemy . Once combat has been engaged , the game switches to the battle screen which utilizes a card @-@ based battle system . 
