What is DirectX?

DirectX is a set of application programming interfaces, which can be used to access specialized hardware features, like grafic accelerators (implemented in all modern grafic boards) or sound cards. For this reason, programming a game like this is less difficult, when DirectX is used. But a big disadvantage of DirectX is that it only runs on Windows based systems. So porting this project to Linux would be a great effort.

Where can I get DirectX?

You can download DirectX directly from www.microsoft.com/directx/. You must only choose your operating system (e.g. Windows 98) and language. Installation is most easy, just run the downloaded file and follow the instructions...