This is how to Save online Flash games to your computer to play OFFLINE! (yes, i copied it from the title)
You need:
A computer
Firefox browser(it will work ONLY w/ Firefox)
YOUR BRAIN
This Instructable

Note: I have a Mac, but it will work on Windows and Linux too

*EDIT* Other people made ibles on this too, but mine doesn't use downloadhelper or any of that crap

Step 1: Getting to the Game

this one's a no-brainer-go to the web page where you play the game and wait for it to load COMPLETELY

Step 2: Downloading the Web Page

Next, go to File->Save Page As... and make sure to save it(wherever you want) as a complete web page.

Step 3: Finding the Game-Part One

Now, you should have TWO folders on your desktop (or wherever you saved it) One, a HTML file, the other a folder called "(name of file)_files"

Step 4: Finding the Game-Part Two

Open up the folder (you can toss the HTML file) and look for a .swf file. That is your game! YAYYYYYYYYYYYY! if there is more than one flash file, it usually is the one NAMED the title of the game. If none are, try them all(see next step)

Step 5: How to Play Your Newly Downloaded Game

Just open it w/ your FASTEST browser (does NOT have to be firefox, i use opera) and there is a free, OFFLINE game so you can play it w/o a internet connection (or, in my case, at my grandparent, OMG they still have dial-up GRRRRRRRRR IT TAKES SO LONG!!!!!!!!!!)