scripting - In GameMaker, is it possible for users to code something into a game while playing, and verify that it is correct?

I was wondering if in GameMaker it would be possible to allow people to code a small bit of the game in so that they then unlock that move/code?

Think of the game DLC Quest, in the way that you had to find a few coins and then you were able to buy the ability to jump, would it be possible to do this but instead of getting people to buy the ability to jump, get them to code it? (Only a little bit of code, of course, not an entire script?)