Board Thread:Geometry Dash Update Discussion/@comment-27413644-20160515095142/@comment-26249594-20161209195545

I think having a puzzle in the Vault would be nice:

So you enter "PuzzleTop" in the Vault (Vault would hint at that word)

Vault then picks a number from 1-100,000 and you do not know which number it is.

You then have to guess the number, and every guess, Vault will tell if his number is higher or lower than yours.

Once you guess it, you get an achievement "Mathematical Geometry!" which unlocks something.

The puzzle can be solved btw :p