In a computer RPG game, the character levels up and begins to effortlessly kill monsters that were once a major challenge. It's a satisfying feeling of progress.
I'm studying Chinese, and no textbook I've encountered has an analogous stage where you effortlessly read material that was once difficult. I wish there was e.g. an interesting short story at the end of my textbooks ("Congratulations! Now enjoy this story you can read without further study---you earned it!"); it's the reward for mastering the textbook's contents, and serves to give a feeling of progress.
As proof of concept, I'm wondering if such textbooks even exist in any language:
Question: Are there language textbooks which include an epilogue which is understandable once the textbook's contents are mastered?