Choose difficulty from what this child or group can read, recognize, and enjoy—not a fixed age formula. Notice whether they recognize the objects in your home, follow a short written direction, prefer pictures, or like figuring out a small comparison.
Use a direct clue when the group is excited or reading together is part of the fun; use a picture or a spoken clue when print would slow someone down. Add one inferential step at a time, and make the first stop especially clear so everyone can start.
If you want examples and a closer look at clue difficulty, use our guide to writing treasure hunt clues. For a route that stays inside, the indoor setup guide covers room-to-room movement and safe hiding.