Kingdom Hearts has been uniquely spread across platforms. The series started with a PS2 game, then began releasing installments on handhelds immediately after - games that were too relevant to the ongoing plot to be dismissed as spin-offs. Thus began Kingdom Hearts' bizarre history of releasing one or two games on a platform and then moving on to a different one. The handheld games have finally become widely available thanks to the release of Kingdom Hearts collections on console and PC, but for a while it was hard to approach any game in the franchise.