First, you must have a copy of the beta. How you get this is of no concern of mine.

Once you have said copy, open up GalaxyEdit, make or open a map, then hit the button that enables you to test said map. This will take you to singleplayer starcraft 2. Viola!

Jack lies to us once again.

Is there Blizzard supported Ai that you can play with during the testing?

I don't know, yet, due to my highly limited computer time. I haven't even tried GE yet. However, you can certainly play UMS maps with it.

Cool, well this morning I started the installation of SC2, so when I get home it should be finished. Can't wait

You can't get a copy with the beta without a beta key... Making this illegal.

The only supported AI is the "Very Easy".

Nobody is talking about how to get the beta here.

Thanks for letting me know.

I have a torrented copy of SC2, and I cannot figure out how to access the editor after downloading the newest patch. In fact, I can't even play any games using the newest patch.

The editor exe (or whatever files launches the editor) should be in your SC2 directory after installation.

I believe you start it with the .exe in the Support folder in your beta directory.