Climb from the start word at the top down to the GOAL waiting at the bottom of your board — change one letter at a time. Every rung must be a real word.
Changed A→O — one letter, still a real word. Green means that letter already matches the goal.
Par 4 Par is the fewest steps the puzzle can be solved in. Matching it is a perfect climb.
Stuck? After you've been climbing a while, a reveal option appears — it shows the answer and ends your streak.
Inspired by Lewis Carroll's Doublets (1879)