NieR: The World of Recycled Vessel

To start the DLC, players have to approach the sparkle point in Nier's house, once Grimoire Weiss has joined their party. It will take both into the diary of Nier's late wife/mother, where in NieR RepliCant, players will play as the older version of Nier, whereas in NieR Gestalt, they will play as the younger incarnation of Nier.

In this dimension, they enter a white room, that contains nothing but a big white door and the exit back to Nier's house. When opened, the door leads to various old and new places, that are filled with powerful Shades. After all enemies of an area are defeated, he'll be transported to the next level. Upon completing all areas of the door, Nier is brought back to the white room and another white door will appear, which again unlocks a third white door if all levels are beaten. In total there are 14 challenge maps, 4 to 5 per door. If Nier loses all of his HP during one of the levels, he is thrown out of the diary and his progress of the current door is lost. However, unlocked doors, will remain open.