Rat Delivery Service

Game:

Unzip into an empty folder. The game should be the only executable in that folder.

Also avoid using the uninstaller. GameMaker 1.x uninstallers can have some issues, so if you want to uninstall you should just delete the folder the game was unzipped into.

Source Code:

Can only be opened in GameMaker 1.x. 

Unzip, and then drop the folder into Documents -> GameMaker -> Projects, then make sure the folder name ends with .gmx