Adventure Levels

As you probably know, for members everywhere (or NMs at the Base Camp), you can show your adventure level, which will look like a number in a shape. :3
As you progress in levels, they get harder and harder to achieve, requiring more courage to level up.

Here are all of the seen shapes of levels:

Each 5 levels has a certain shape:
1-4: Circle
5-9: Star
10-14: Diamond (ish)
15-19: Square

What do you think the other ones are?
20-24?
24-29?
Have you seen any that high?

~Quinn