This is the final level of Peggle's adventure mode, and it is one of the hardest. The spinning double helix in the middle is very difficult to navigate or hit accurately. I've found that using Zen Ball is the only way to effectively complete 11-5. When you shoot, especially on your Zen shot, try to wait until the top part of the helix is barely open, then fire inside. This can assure that your ball won't just bounce back out. Overall, it takes a lot of precision and luck.