This is a collection of old NES rom hacks (mostly SMB1) from many years ago. Many are incredibly difficult, glitchy or otherwise strange. Some are hacks are from various authors that were downloaded from zophar's domain or, where as others are original productions from the kids in the afterschool program at Greystone Elementary in Saskatoon. If you play a hack that takes you immediately to world 0-1, this indicates that it was built from an incorrectly ripped rom image. There is a program called smb_fix that can correct this. Alternatively, you can just hold A while you press start on the title screen as a workaround.