As of the sharing of this project, the 15+ and NM ratings were unused, but 15+ might get its first usage in 2026. For NM, it'd be 2029. If you are less than 7 years old, you can only use the 2+ rating. If your age ranges from 7 to 11, 2+ and 7+ ratings are usable. If you are at lease 12 years old but younger than 15, usable ratings range from 2+ to 12+. If you are 15 or older but not 18 yet, NM is the only rating you should stay away from. And if you are over 18, any rating can be used.
Credit to @LolMichelle for the original. If you use any of these ratings, giving credit to me would be really appreciated. If credit isn't given, you WILL be advised to do so, or your project might be reported. If it was someone else who didn't give credit, you can let me know about this, and the situation will be delt with.