A lot of websites offers different kinds of games; they also offer games through the internet or simple offer downloadable games that you can play at home. Those website offer downloadable demo game that can everyone can play with but as it is named demo, it is only playable by one an hour or two.
There are other games which you can download for free like the games that you can find on site that offers downloadable games and you can download casino games in it. A casino games are commonly being downloaded to a certain website you can also play casino slot games which are also for free.
But downloadable games are still the best game to play as you do not need any internet connection and it probably run faster than the internet games because they only dependent on the speed of your computer. While internet games are relying on the speed of your connection.