This game is called a "word ladder" and was invented by Lewis Carroll in 1877.
Rules
Weave your way from the start word to the end word.
Each word you enter can only change 1 letter from the word above it.
Example
EAST is the start word, WEST is the end word
We changed E to V to make VAST
We changed A to E to make VEST
And we changed V to W to make WEST
Done!