Go to http://www.doombuilder.com and get Doombuilder, then install it. Go to http://www.freewebs.com/treefrog/srb2.cfg to get the Sonic Robo Blast 2 Config for Doombuilder. Download it into the Doombuilder folder, then launch doombuilder. Your now ready to begin a free adventure in SRB2 level creation, exepting expenses on the time you spent online and the price of the space Doombuilder now occupies on your computer! :D