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The grid is 4 columns by 7 rows. Only the middle row accepts your input — that's the throughline.
Vertical words are 3 or 4 letters. Clues sit above or below the throughline depending on the column and the day's layout. Your throughline letter either completes a downward word or starts one.
When every valid throughline has been submitted, you win. Use Submit after typing each guess — there is no auto-check.