I am actually in the process of learning AS3 just to make the most amazing tetris game -ever- (lol). Actually you can see pics of it
| and here
Single mode, challenge mode, shop (redeem tokens you get from challenge mode), and online mode to play against many players. It's difficult being that I know very little about AS, but I found many tutorials on these forums, google, and on flashkit. TBH, I could really use some help making this free game lol but I figure it'll destroy the challenge of making it all up myself
Like I said, flashkit.org is a good place to start, but it's a little messy, buggy, and has a crappy community.