Futari wa Precure Max Heart: Danzen! DS de Precure Chikara o Awasete Dai Battle Cheats

When you first start the game, you'll only be able to select the Arcade Mode. Beating it, however, unlocks a few extra features and modes. You'll be able to unlock a third playable character, a gallery with various cutscenes and art, level select, and a few mini-games.

Though you'll obtain much of the game's art gallery in a single playthrough, you'll still be missing a few scenes and art. You'll have to play through the game again with the third bonus character in order to get them all.