About Tic-Tac-Toe 4×4 — ⨯ 4-in-a-row variant
Tic-tac-toe scaled up — 4×4 board, get 4 in a row to win. AI uses a heuristic that scores attack patterns and blocks defensively. Harder than the 3×3 classic.
How to play Tic-Tac-Toe 4×4
- Click any empty square to place an X.
- AI replies with O.
- First to get 4 in a row (row/column/diagonal) wins.
Tips & strategy
- Take corners or center — never the inner non-corner edges first.
- Set up double threats — two unblockable wins at once.
- Always block AI's 3-in-a-row immediately.