After each guess, the tiles show whether your letters occur earlier or later in the alphabet compared to the correct letters. Earlier means closer to A, later means closer to Z.
🟩 - Once you place a letter correctly, then future guesses must contain that same letter in the same position
🟨 - Once you place a correct letter in an incorrect location, then future guesses must contain that letter in a different location
⬜ - Once letters have been guessed and eliminated, then you can no longer use them
The range of possible letters is shown on the tile and the keyboard as you type