From Wikipedia: This game is mostly a visual novel, but there are a few new techniques specific for the DS. When using Lux-Pain, the player 'digs' into their surroundings using the stylus and touch screen. The player can also 'dig' into people's feelings and emotions to find worms, or deep emotions. However, if the player digs in too long and is unable to erase the worms that surround the person, the person's mind becomes corrupt and it becomes game over for the player. The game also ends if you lose a battle against one of the Silent. However, in some cases, if you lose against a Silent (mainly in boss battles) you are able to retry.