I think you're talking about how zapper will "fly" when you hold down the supper hop key. Although you don't actually fly, this feature allows you to hover for a second before landing. It can be useful if you need to time a jump to avoid a bad guy (to let them crawl under you or to wait for the man eating plant in the rockface chase level to open). Be aware that there are some bad guys you can't jump over! Hope this helps. Good luck!

Can you be a bit more specific with your question, and what is the "fly thing" ???
Pleae explain it a bit more.