What are the rules for mandalas?

Excuse me, could you please clarify what you mean by "mandalas"? If you're referring to the spiritual or artistic practice of creating mandalas, the rules or guidelines can vary greatly depending on the tradition or culture in which they are practiced. In general, mandalas are often created with the intention of fostering inner peace, balance, and harmony. They may be used as a form of meditation or as a way to express oneself creatively. Some traditional practices may have specific rules or guidelines for creating mandalas, such as using certain colors or symbols, or following a particular pattern or layout. However, ultimately, the rules for mandalas are largely up to the individual creating them. If you're interested in learning more about the rules or guidelines for creating mandalas in a particular tradition or culture, I recommend doing some research or seeking guidance from someone with expertise in that area.