First print copies of Hearts R gave access to a special downloadable game called Tales of Hearts R: Infinite Evolve. Rendered in the same graphic style as Hearts, it is a game separate from the main story with an exponentially increasing difficulty level.
This 2D action RPG uses the sprites from the DS version of Tales of Hearts. It looks like you can switch between Shing and Amber by pressing the L button. You can call in crossover characters from other Tales titles with the right analog stick.
Players earn gald for defeating monsters, which you can use to purchase HP/TP restoring gels, attack/defense boosting items, and other partner characters.