Summary: I assumed it was compatible with 3DS because most DS games can be played in 3DS (at least I haven't found any that cant - until now). Its not compatible with 3DS which would have a been a nice thing to have in your description of the product, unless the company is hoping that consumers will purchase this product and not want the hassle of returning it after they find out it does not work on they system. Good way to make money and deplete the inventory.
Summary: Be warned before buying this game. Mediocre reviews aside, Capcom is again pulling some shady and pointless business practices just to save some money that only harm the fans/consumers in the end. Specifically, this game is purposely limited to a single save state that is not erasable. What this means is, after you play through the game and unlock everything/level up everything, you will NEVER be able to restart a fresh game and play again from the start.
Summary: Supposedly Capcom wants to keep their game from being sold on the used game market, which is understandable, but the way they implemented it through limiting you to only one save per game, ever, has far wider implications that would only hurt you as the consumer: - You cannot start over, unless you want to shell out another $40 for a new game. - You cannot replay the game, unless you want to shell out another $40 for a new game.