How to change the score through lua?

[ClearMan06]

I recently started learning lua, and it goes pretty smoothly, but I have one problem I can't seem to solve:

How would one go about changing the score through the luna.lua file?

The PGE wiki says to use Misc.score():

It can read the score perfectly fine, but if I try to change it with something like Misc.score() = Misc.score() + 50 then it gives me an error message:

How do I use this function correctly, so that it properly changes the score value?

Thanks in advance!

[Emral]

You can't just.. assign to the result of a function call.
If you're on the most recent version, you can use Misc.score(n) to add n points to the score (where n is a number)