Use the invisibility potion

1. The numbers represent alphabets, where A is 1, B is 2 and so on.
2. Take the letter's position in the alphabet, add 8 and take that letter instead. (A becomes I, Y becomes G and so on)
3. Type in the code, but shift your hands one key to the left. (Instead of O, press I and so on. Only works on qwerty keyboard though.)
4. It's a base64-encoded string, use a base64-decoder for that.

First answer:

master branch

Second answer:

there is a treasure hidden somewhere, it is located at a secret place in the pacific ocean

Third answer:

in a world full of blocks

Fourth answer:

the plant is famous because of the ability to cure some diseases

See the source code of the page

Btw that effect of the potion doesn't help you in battles

EDIT: It seems that i get down votes, I will explain this a little more further

The real text:

X Potion (not the Candy Box 2's)
Effect: Unknown
How to make: Mix all potions listed above (1 each potion) and add 100000 gold bars and 100000 iron bars