So we're posting our favorite flash games, I had a tough time narrowing this down but one game that I have consistently come back to is Dolphin Olympics 2 by Alan Rawkins. It sounds weird, I know, let me explain.
Dolphin Olympics 2 is one of those games that is so ridiculously simple but also so addictive, you have to keep coming back to it. You've got two minutes to do flips out of the water. Hitting rings gives you a boost of speed, and the more flips you do the more points you get. That's it.
In my opinion it really has a lot of what makes a great flash game. Intuitive, addictive, and easy to play in small doses. Once you play it once you'll play it again.