To launch the game under Linux :

Launch the index.html file using your favourite browser. Your browser should be up to date and use a Flash plug-in version 8 or above.
WARNING : some versions of Flash Player may not work correctly for Amertis. If that’s the case, download the Flash Player version adapted to your configuration HERE

But know also that since Amertis does not require a considerable amount of resources, it will work nicely with the free Windows emulator Wine.
In that case, install the game using the procedure described for Windows users.