Earths Dragon Balls
Rules- You must wish in English.
Exceptions- You have to wait one year (365 earth days) to use the Dragon Balls again. You can't wish someone back more than once.
Features- You're allowed to bring back multiple people as long as they haven't been wished back before.
Namek's Dragon Balls
Rules- You must make your wish and say the password in the Namekian language.
Exceptions- You can only revive one person with each wish. You have to wait one Namekian year (about 130 earth days) before you can use the Dragon Balls once again.
Features- You're allowed three wishes. You can wish back the same person more than once.
Black Star Dragon Balls
Exceptions- When a wish is granted, instead of the balls spreading across the earth they spread across the universe. If the balls are not gathered with in a year of the wish, the planet the wish was made on blows up.
Features- These balls are twice as strong as the regular Dragon Balls.