Undertale: the Power of Dog Residue

In a room inside of Undertale, there is a piano puzzle. If you can solve it, you will find a room with a "Legendary Artifact." If you attempt to pick it up, you will get a message saying "You're holding too many dogs." If you check your inventory, there will be an item called "Annoying Dog." If you drop it, it will run towards the artifact and "absorb" the artifact. It will then clip through a wall and go offscreen. Check your inventory again, and you will have an item titled: "Dog Residue." If you use the item, it will duplicate itself, sometimes giving you a "Dog Salad", a weak healing item. Not too far off, you can find the Tem Shop. If you sell the Dog Residue to Temmie, then duplicate it again, and continue to repeat, you can gain a virtually INFINITE amount of money or healing items.