Days and Recoded are the only DS titles they release. BBS was on the PSP and 3D was on the 3DS.
This one is the previously unreleased outside of Japan, Final Mix. It's basically the same game we had but with more cut scenes, new key blades, some new baddies and a color pallet switch for some baddies.
over all it's been fun.
2.5 came with the final mix of Birth by Sleep too, so that's cool. I've been playing that when i can get away from AC: Unity. It also has the cutscenes from Recoded.
The first one 1.5 Final Mix had Kingdom Hearts Final Mix and CoM as playable, with the cutscenes from Days. Personally i would rather have had Days be playable than CoM again. I played CoM on the GBA and the PS2 it wasn't fun for me but then I had started with the first title. Hades is a pain V, just gotta find the right combo of cards to kick butt.
Recoded is sort of a recap of the first game, in it's own way and Days is part of the story between 1 and 2, so they have their place in the universe. BBS is actually the first to take place thought 10 years before KH1. So yeah still a great game!