You broke into the school at night because you skipped your PE class, and the teacher holds a grudge against you. As a result, he decided to give you the lowest grade in all subjects.
Find the grade book, fix the grades, and escape to freedom. You will need to find the grade book, which is in the PE teacher's office. You will also need to avoid the principal, who is looking for you.
There are two dangers in this game: the principal and the PE teacher. The principal has a keen sense of smell and can track you down if he gets close enough. The PE teacher is angry with you for skipping PE class, so he will not be sympathetic if he catches you.
The only way to appease the PE teacher is to bribe him with vodka. If you can give him vodka, he will be more likely to give you the grade book.
If you get caught by the principal, you can use the PE teacher's sympathy to your advantage. If the PE teacher sees the principal chasing after you, he may feel sorry for you and be more likely to help you.
A small advice for you is that you had better look for vodka as long as you are there.
The game ends when the principal catches up to you. If you can escape the principal and fix your grades, you win the game.
Will you escape that one school from the nightmares? Play and find it out!