This is a simple but effective technique for downloading and playing flashes from Newgrounds or any other flash site offline and store the .swf files on your home computer.
1): Create an html page with a download link using a word editor such as Notepad or Dreamweaver. It can be as simple as this:
2): Go to your newgrounds flash page where the game and/or movie is being played. I’ll use
Super Mario Crossover as an example.
Right click and ‘View Source’. You’ll get the source code of that page.
4): Now just right click the link you made on your html page and select ‘save target/link as’ and you’ll be asked to save the swf file.
Download Swiffplayer and install it so that you can play the swf file on your computer. That’s it! You can use that view source trick with any Newgrounds flash and play it offline. It may not work with some flashes due to some games requiring you to be online. For other flash sites, it’s similar, just find the link they use for the flash and paste that link.