Zone 6 is available in challenging mode not easy,Zone 7 is unknown but krin said that theres something secret in there,My proof is that go to the blog so that you will know also krin says it for himself that zone 7 is secret
Uh... First time I played this, I did an Easy/Bio run, since I wanted to "get my feet wet" (ie, get a feel of it). When I completed Zone 5, I quickly grew bored and decided to wait for the update. When it updated, I had Zone 6 in my Easy file. That means that it's NOT mandatory to do it in Challengin/Heroic.
Also, on the Newgrounds page of Sonny 2, Krin himself said Zone 7 is unlocked by obtaining Legend Achievement. So... yeah, old news.
