Kingdom Hearts: Birth by Sleep is an action role-playing game for the PlayStation Portable. It was developed and published by Square Enix.

Kingdom Hearts 358/2 Days is a role-playing game developed by h.a.n.d. and released on Nintendo DS.

Kingdom Hearts: Chain of Memories was developed by Square Enix for the Nintendo DS. The game falls between Kingdom Hearts and Kingdom Hearts II and explains why Sora has lost his memory. It makes use of a card system for combat where you must collect cards to make actions.