I made Hangman. It has some (loose) difficulty levels, and the text to display the letters you have left to guess is dynamically sized based on how long the word is (to see it in action, play on Hard a few times).

Overall I feel pretty good about how this went - there were some stumbles as I picked up enough AS3 to know what I was doing, but as my skills improved I got a lot closer to being able to write what I meant and have it Just Work. While it probably won't win any design awards, I'm pretty happy with my results so far.