Don't know if this has been mentioned. In the basilisk level right at the end as you are to defeat the big snake. He kept disapearing on me. I would grab the sword and boom he was gone. Couldn't finish the level. I finally got past it after many replays. I stayed in the little opening on the big head where the sword is found don't go out on the head to kill the snake do it from in side the little cave. Hope it helps some one.