How do you create flash games?

[Buff_]

That's all possible, but you would need a guide to using the codes and things. You will also need a lot of time on your hands.

[Chaukai]

Also, you have to take in consideration lots of things like the file size and you gotta make sure everything is synced, make all the frames, whatever. >.> Most games take a very long time to make, especially by yourself. If you're planning on making a flash game, you should think ahead, and make sure EVERYTHING is planned out.