4×4 Tic Tac Toe

The Tightest Board in Tic Tac Toe

4×4 tic tac toe still uses a four-in-a-row target, but the board is smaller and tighter than 5×5. It sits right between the classic game and the wide-open 5×5 board. There are only 10 winning lines: four rows, four columns, and two diagonals.

Each line needs all four of its squares filled, so blocking is easier here than on bigger boards. To actually win, you have to threaten two lines at once from the same pair of squares.

Why So Many Games End in a Draw

Every line takes four marks to finish, so one good block can kill an entire threat. Well-played 4×4 games are often draws. The real skill is spotting the single moment your opponent leaves a line unguarded, then punishing it before they notice.

Some rule sets also count a square (four marks forming a 2×2 box) or a diamond (four marks in a diamond shape - a 2×2 box tilted 45°) as a win, just to cut down on draws. Our version sticks to the standard lines-only rules - The version you'll meet almost everywhere else.

How 4×4 Stacks Up Against the Other Boards

Every board on this site rewards the same fork-based thinking, just at a different scale. Here's how they compare:

Want more room to build open-ended threats? The 5×5 board is the natural next step. Want a completely different kind of depth? Try Ultimate, where you win small boards to win the big one. Curious why perfect play on the classic board always ends level? Our math page breaks it down, and that same logic is why careful 4×4 defense leads to so many draws.

How to Actually Win on 4×4

Since single threats always get blocked, 4×4 wins are built from overlapping lines. Two attacking patterns do the work.

Two Attacking Patterns that Work

• The corner cross. A corner square belongs to a row, a column and (for two of them) a main diagonal. Stacking your marks around a corner forces the defender to split attention three ways.
• The double-ended row. Get two marks in the middle of a row or column early. It can still be completed from either end, so one block isn't enough if you've kept both ends open.

These are the same fork ideas that decide the classic 3×3 game, just spread across a bigger board. If you want forks explained from scratch, read our strategy guide.

A Simple Defense Checklist

Check your opponent's lines every single turn. Two rules keep you safe:

1. If they have three marks on a line and you have none, that line is an emergency. Block it now.
2. If two of their lines share one empty square, blocking either line alone is too late. Fill the shared square one move earlier, before the second line even forms.

Practice both patterns against a friend in two player mode, where you can pause and talk through each move together.

4×4 Tic Tac Toe FAQ

Do you need 3 or 4 in a row here?

Four. A three-in-a-row target on a 4×4 board is a quick forced win for whoever moves first. That's why standard 4×4 play, including our game, always uses four.

Why do so many games end in draws?

Only ten winning lines exist and each needs all four squares, so a diligent defender covers threats efficiently. That's the charm: a win on 4×4 means you genuinely out-planned your opponent, usually with a double threat they couldn't split.

Is 4×4 tic tac toe always a draw?

Not always, but draws are the common result between careful players. Every four-in-a-row line needs all four of its squares, so one good block kills a threat - Wins come only from a double threat the defender can't cover. With perfect play, 4×4 is generally regarded as a draw, much like the classic 3×3 board.

Is 4×4 harder than 5×5?

Harder to win, not deeper. The 5×5 board has 28 winning lines and rewards attack; 4×4 has 10 and rewards patience. Play both - They train opposite instincts, and Ultimate will happily consume whatever skill you build on either.