What do you do after you put the disc in the computer

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

There is, quite literally a 50% chance of the pizza being rotten.

On success of that random event, the following message appears and a random amount (between 10 and 50) pizzas is eaten:

Nom.. nom..
You eat the pizzas, luckily they are not rotten

On failure, you are poisoned, giving various negative effects throughout the game. The poison can be removed, as per the message that appears:

Nom.. nom..
You eat the pizzas, but... they are rotten!
You are poisoned, this causes you to die easily in battles even if you have a lot of hp
Luckily you can heal yourself by drinking 10 health potions [Drink 10 health potions]