Building A Flash Game...

Does anyone know how I can go about creating a simple flash game like the one here...

http://www.entheosweb.com/Flash/game2.asp

I know it's a tutorial itself but because it is so new the tutorial hasn't been placed yet. Does anyone know of any good sites to create a game like this?

Many thanks for your help.

Don't know about that particular game but you'll find lots of stuff about creating games here (http://www.flashkit.com/tutorials/Games/), here (http://www.tutorialized.com/tutorials/Flash/Games/1) and here (http://www.flashdeveloper.nl/g_flash_game.html).