In Yume Nikki, there are three vending machines, found in Dense Woods A, Hell, and Docks A, from which the player can use yen to buy 'health drinks' that increase Madotsuki's health.
Yen
Yen is the currency system of Yume Nikki and is required to operate the vending machines. It has no other function in the game.
Yen is acquired by killing NPCs with the Knife effect. Most killable NPCs have a 1 in 8 chance of yielding 100 yen when killed, though there are a couple exceptions to this:
- Organoid, who can be found in the Sky Garden, always produces 100 yen every time they are killed. This is likely because they teleport away when Madotsuki gets close, making them difficult to kill.
- The Goblins in the castle room of the FC House have different chances of dropping yen. The small Goblins have a 25% chance of dropping 100 yen while the big Goblin has a 50% chance of dropping 200 yen. Killing them is the fastest way to gain yen.
There is also a room in Number World filled with Wheelies known as the Stabbing Room by fans due to the method of clearing it with the Knife effect. It can yield a moderate amount of yen when the room is cleared, as the 1/8 chance of dropping yen is still the same for the Wheelies.
The amount of yen in possession can be checked in the bottom left of the menu. The fact that the yen acquired while dreaming stays in the menu after waking up may suggest that Madotsuki is always dreaming, but this detail may have simply been neglected.
Health
Madotsuki's health points can be found in the pause menu and the save windows, represented by a heart icon. There is no practical benefit from this as there are no damage hazards that can physically hurt Madotsuki in her dreams. Therefore, there is no need at any point in the game to increase Madotsuki's HP other than for the personal satisfaction of the player, or as a mark on the save data window.
Yume Nikki was made in RPG Maker 2003, a game engine typically used for RPG games that utilize character health points in battles. The HP system was likely implemented as a way to take advantage of this feature.
As health can never be lost, Madotsuki's HP and max HP are always the same value.
Vending Machines
Vending machines sell pink drinks that increase Madotsuki's HP. There are three unique vending machines, each found in a different world.
Dense Woods A
The machine in Dense Woods A is located next to the entrance from Puddle World. It dispenses a small can that costs 100 yen. The drink will add 1 HP.
Hell
The machine in Hell is located west of the Nenrikido of the Face Carpet Plaza. It dispenses a medium-sized bottle that costs 130 yen. The drink will add 1 HP, and has a 33% chance of adding an additional point. This vending machine is the most cost-efficient.
Docks A
The machine in the Docks A is located near the staircase from the Sewers. It dispenses a large bottle that costs 150 yen. The drink will add 1 HP, and has a 50% chance of adding an additional point.
Gallery
The Dense Woods A vending machine.
The Hell vending machine.
The Docks A vending machine.
The various health drinks.
A vending machine in the manga.
