Mad Scientist
The Mad Scientist can be found under:
World -> Mad Scientist
The Mad Scientist can make certain mutation potions with the given ingredients needed to make the potion, and an extra accessory.
In order for the Mad Scientist to make a potion, you must have equal or more of the # of rocks, earthworms, roots, and crystal shards in your inventory. These items can be found from playing the Mining game, and can be searched in the inventory under "Unusable".
Once you have the items needed, find a potion you'd like to try and click "Tell me more!".
From then, the Mad Scientist will also ask for any accessory as a 'payment' to make the potion. Then, click "Make this potion," and the Mad Scientist will give you a ________ potion, which can be found in the inventory under "Potions". Like marking and mutation pears, potions cannot be 'undone'. Each potion gives your selected Waja a specific mutation, apart from the custom mutations.
As of January 11, 2011, this is the current list of potions that the Mad Scientist can make:
Arista Potion
Classic Potion
Livingston Potion
Nightmare Potion
Prehistoric Potion
Ptthhh Potion
Slime Potion
Thago Potion
Xenu Potion