THE 9 LINES — always on
Every line starts on the left and runs left to right — one cell in each column. No vertical column lines.
Line 1: middle straight — middle, middle, middle.
Line 2: top straight — top, top, top.
Line 3: bottom straight — bottom, bottom, bottom.
Line 4: diagonal down — top-left, center, bottom-right.
Line 5: diagonal up — bottom-left, center, top-right.
Line 6: the V — top-left, center, top-right.
Line 7: inverted V — bottom-left, center, bottom-right.
Line 8: middle, top, middle.
Line 9: middle, bottom, middle.