It’s Elementary – Answer
Go from ONE to TWO in nine easy steps.
Start with O-N-E, finish with T-W-O and insert eight three-letter words between them
Each three letter word must be valid (in the Scrabble dictionary).
Each three-letter word can only have one letter different from the preceding word.
ONE
owe
ewe
eye
bye
bee
tee
toe
too
TWO