Free Third-Party Games On Your Website
There are several different websites that specialize in providing free games that you can add to your own website. Most of the free games are fairly simple to play and similar to what you will find in many cell phone game apps. You won’t be playing anything as cool as Assassin's Creed or Mario Bros. but many of the games are fun and, most importantly, free.
Here are a few places to download games Crazy Monkey Games and Free Games Jungle.
With these websites, the vast majority of web-based games are Flash. These sites and others usually zip up the HTML markup that you will need along with the .swf Flash file that is the actual game.
Create Your Own Flash Game
If you want to go all out and build your own stellar Flash game for your website then I suggest that you start by playing a variety of other Flash games to get a feel for what works and what doesn’t. Then once you come up with your concept here are a few websites and tools that might help you in your endeavor.
2.Read some Tutorials at Flashkit.com– There are tutorials here for everything from getting started with your first game to the more advanced physics in game development.
3.Sprites and Textures– Find some textures and sprites to use. There are quite a few sprite & texture sets available to get you into development quickly and many are free. This can be a great time saver, especially in the beginning of your game development. You can always create your own custom sprites and textures later in the project if you like