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It's a hidden gem. You flip between different timelines. When you get blocked in one, you change to the other one and as you go through those events, you learn more about the plot going on. The gameplay is also good as it's a tactical RPG and you can move your opponent's turn up so you can have a bunch of turns one after another. I would give it a try but it's a DS/3DS game so you might have to emulate. I think they already stopped the online shop for the DS/3DS shop.

Hmm. Maybe they can port it on mobile similar to what Konami did to FF and DQ titles. It's missing the excellent audio voice acting but the game is still the same.

The developers are Atlus but I think they are focusing more on Persona or Shin Megami Tensei. So I don't think they are doing anything with Radiant Historia right now. Maybe they will in the future.