I wrote a small game in the last few days. The game is called IGot24.
The idea is to use 4 basic arithmetic operations to get result 24 from 4 randomly drawn cards. I talked about the algorithm and python implementation in an old post. In fact, it's currently the first result on Google for "calculate 24".
The game is at:
http://calculate24.appspot.com/
I first wrote the game using pure JavaScript. Later I thought whoever play it may want to get solutions. So I created the backend with Google AppEngine that supply cards and solutions. Then I added a few more options, like getting only solvable cards, disabling timer, calculate 42 instead of 24, etc.
The heart of the JavaScript code is a finite state machine. At first I just coded away thinking it'll be simple, then gradually realized there're more states. I then drew a state diagram and found out there were 21 states! They are all branches, there's no loopback, so I don't think they can be optimized. (Maybe they can, but I don't want to re-read my circuit design book from ages ago to find out)
I think the game can be easily re-done in flash using Flex, since JavaScript can be ported to AS3. It can be ported to IPhone too but it will be waste of time and money (to buy a mac to do iphone dev) because I found a "calculating 24" iphone app got downloaded a whopping 12 times.
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