The phrase "a grid of letters" is correct and usable in written English.
It can be used to describe a layout or arrangement of letters, often seen in puzzles, games, or educational materials.
Example: "The teacher handed out a worksheet featuring a grid of letters for the students to find hidden words."
Alternatives: "a matrix of letters" or "a letter grid".
"You have a grid of letters," Shortz explained.
Searching for shows often means ploughing through ever-growing alphabetical lists or clicking around a grid of letters.
Instead of having to toggle around a grid of letters to spell out the title or name, you can type it.
Long before eye-gaze computers came along, his father, Gary, developed a grid of letters that Jason could use to spell words by aiming his eyes, and he is able to compose with the aid of a computer.
Consider for example the Sperling paradigm, in which subjects are flashed a grid of letters, and only subsequently given a tone that indicates which row to report (high for the top, medium for the middle, etc).
People of all ages played board games pitting two players against each other, including latrunculi ("Raiders"), a game of strategy in which opponents coordinated the movements and capture of multiple game pieces, and XII scripta ("Twelve Marks"), involving dice and arranging pieces on a grid of letters or words.
At its core this game is simply about spotting words among a grid of random letters on the screen; when you select a word, by tapping or dragging, the letters disappear and the ones above drop down.
The "Interactive Activities" section includes a word search game in a large grid of letters, images from other parts of the app with brief descriptions, and a quiz consisting of multiple-choice questions on facts presented elsewhere in the app.
You are presented with a five-by-five grid of letters, and when it's your turn, you tap the letters to make a word.
He sent police a grid of numbers and letters.
My father recalls he had a map of sorts; a grid of numbers and letters, I presume sent to the families of the deceased after the war.
