Our readingWhat is a korrent?
A puzzle that invites guessing and then punishes wrong guesses stops the player learning the very method it could have taught.
Drawn from what Raph Koster said
What these subjects mean
design How things should be made and judged: what makes a design good, who should do the designing, and what an interface is for.
video games Games as software and as storytelling: how they are made, by how few, and what the medium does better than film.
Mental modelDesign is how it works