Tower's Rules

There are many  which govern how people can function within the Tower and also dictates how tests are implemented and how the test-takers conduct themselves. Irregulars have the ability to override certain rules.

General Rules
A Ruler cannot rule without a Guardian.

One cannot manipulate Shinsoo without a contract.

During ancient times, it is unknown if "chosen ones" were required to form a Shinsoo contract. From basic "physics" of the Tower we can assume they could control Shinsoo ("Irregulars are free from all contracts" ) but it's also assumed that Shinsoo manipulation with a contract is obviously stronger than manipulation without a contract.

Zahard was the first person in the Tower to make a contract. It is ambiguous what form of contract Zahard formed with a Guardian.

In the current political system, Headon visits the Outer Tower and Middle Tower to select Regulars. At this point this is only known way that Regulars are chosen. It is unknown if this current selection process is part of a contract Zahard made with a Guardian like Headon. Someone that enters the Tower of their own accord and/or power is known as an Irregular; this goes against the laws of the Tower.

Breaking rules during tests means an automatic fail. If a Regular breaks rules during idle time between Tests, then punishment is usually metered out by Test Administrators. (Note: so far we only know that this most likely applies only for the 2nd and 20th Floor, because Regulars there have to pass more than 1 test and they are accommodated there. On different Floors, Regulars are free to live wherever they want.)

Irregular's Tests
In this section, the original definition of an Irregular is used and applied because the Tower still chooses people to take the Guardian's test and climb the Inner Tower, despite the current political situation.

Tower's Rules regarding Irregular's tests:
 * 1) Only Irregulars may request to take a Guardian's test, although people who are not Irregulars may participate in the test. It is unknown if the latter is an exception that occurs because of the Irregular's wish or because this is part of the rule.
 * 2) Only the Guardian of the Floor may decide if it will fulfill the Irregular's wish.
 * 3) With the exception of Irregulars climbing the Tower by passing tests directly from Guardians, the same rules as for Regulars are applied to them.

Testing Staff and Regular's Tests
Take note that all test takers are referred to as "Regulars" because Irregulars are very rare. As Regulars, they're entitled to many rights including protection under the Tower's Rules. Test staff are likely prohibited from causing harm to the test-takers unless they're taking part in a test where rules allow them to injure the Regulars, for example: Quant during the Hide-and-Seek test. (Though it must be noted Yu Han Sung snapped Mauchi's bones without any repercussions but perhaps, that was because he had failed and was no longer a test-taker. And as a failed Regular on the 2nd Floor, he had no rights and likely, was excluded from the protection of these rules.)
 * 1) Once test rules have been specified there isn't a way for those rules to be changed.
 * 2) Once the test has started, it can only be stopped if the individual has given up or dies.
 * 3) When a test is created and implemented, the Regulars must be given fair and equal opportunities to pass and no Regular should be favoured over another.
 * 4) "You must not harm the boy. That is what is fair." - Augusgus to Mule Love.
 * 1) Rankers who are not participating in a test are not allowed to interfere with the test-takers. They may interfere only if the test rules and conditions specifically allow them to do so. (This is because in the Inner Tower of the Floor there are Rankers (including the Testing Director and other Testing Admins) who are not involved with the current test.)
 * 2) Due to rules 3, 4 and 5, Test staff can't favour any specific Regular or make that one Regular fail, but they can easily make the test almost impossible to pass for an entire group of Regulars.
 * 3) This is seen to be true when Headon "bent the rules a little" for Baam's test and on the Second Floor when the Guardian allowed Ren and Yuri Zahard's party to meet and clash during the Submerged Fish Hunt test.

Rules Regulars must agree to
A Regular may be protected under the Tower's Rules but they have to obey a separate set as well.

Each Floor is governed by a different Ruler so most likely the same rules aren't applied everywhere. So far we only know that killing other Regular is no good. Of course "accidents" during tests are exception...