What you need to do is go up one slot if you change a letter in the bottom slot. Changing a letter must make a NEW word in order to move up one slot. Continue changing a letter in each of the words in order to make the one at the TOP. ………… Here's an example: [Bog] ← Top [Bag] [Bat] [Cat] ← Bottom It went from 'cat' to 'bog' by changing one letter in each word before to make a new one. …………