Hey, This is the download link to Powder Toy with 20 Elements that includes the eraser tool.
This version is older than version 26. I'm assuming it's older than 25.

http://www.megaupload.com/?d=GIEWEBJB

P.S. I don't have the link to where I downloaded it from, because I downloaded it about 1 1/2 to 2 years ago.


Enjoy!

~J