What do the numbers inside a square mean? What are the perks?

Each day, you start with a fresh board. As you earn points, you earn perks for that day's puzzle:

1. Squares show a number in the bottom left corner representing how many words start with that square.
2. Squares show a number in the bottom right corner representing how many words include that square (anywhere in the word).
3. Hints are unlocked in the word list, letting you sort your missing words alphabetically and see their starting letter.

If you see a plus sign (+) in a square, that means that 10 or more words start with (or use) that square.

If the numbers are too small, try enabling "Enlarge small text" in Settings.