if I ask for a hint, it tells me to "use 10xp of my 148xp" whats that all about?

Question

hints and answers!

Answer 1

I think it deducte your XP for using the hint.
They want us to solve the problems by own :)

Answer 2

ok, but I still don't know what an 'xp' is, nor how to access the hint

Answer 3

XP is for experience