1. unzip these folders somewhere safe
2. open Eclipse
3. navigate to "File/Import"
4. choose "General/File System" and press next
5. open with "Browse" the unzipped "src" folder and press next
6. Eclipse detects the 4 folders, press finish to import them into your workspace
7. to run the game on a desktop computer choose the "anvil-desktop" project and run its main function.