Free Four in a Row Online
Drop red discs into the grid. Be the first to line up four in a row horizontally, vertically or diagonally.
About This Game
Connect four style games train look ahead search, the same reasoning tested in the NIH-funded ACTIVE trial, where reasoning was one of three abilities trained in 2,832 older adults with gains that held for years.
The game is mathematically solved. With perfect play the first player wins by starting in the centre column, which tells you something useful: on Hard, losing as second player is often correct play meeting better play, not a mistake.
Beating Hard mode consistently is the real benchmark. Beating Easy says little.
The tip most people miss: count parity. Because discs stack, the row a square sits on determines who can ever occupy it. Odd numbered threats favour the first player and even numbered threats favour the second. Strong players deliberately build threats on rows their opponent cannot reach first, then simply wait. Casual players build threats wherever they happen to land and cannot understand why the win never arrives.
How to Play Four in a Row
You play as Red and always go first. Click the arrow above any column to drop your disc into that column. Discs fall to the lowest available row. The computer then plays Yellow. The first player to get four of their discs in a straight line - horizontally, vertically or diagonally - wins. If the board fills up without a winner, the game is a draw.
Easy vs Hard Mode
Easy mode gives the AI a limited look-ahead, so it misses some threats and opportunities. Hard mode gives the AI deeper search, making it much more difficult to beat. It evaluates positions, blocks your threats and builds its own winning lines.
Tips
- The centre column is the most valuable. Discs there connect to the most lines in all directions. Open with the centre when possible.
- Think two moves ahead. If you create two threats at once, the AI can only block one of them.
- Avoid filling columns all the way to the top early - you may hand a winning disc position to your opponent.
- Watch for diagonal threats, which are easier to miss than horizontal or vertical ones.
FAQ
What grid size does this use?
Can I win on Hard mode?
Try Next
How Do You Play Four in a Row?
Players take turns dropping a disc into one of seven columns. Discs stack from the bottom, so you choose the column but not the row. The first player to line up four of their own discs horizontally, vertically or diagonally wins. Click or tap a column to drop. A full board with no line is a draw.
The constraint that makes it interesting is gravity: you cannot place a disc anywhere you like, so every move also decides what your opponent can reach next.
What Are the Cognitive Benefits of Strategy Games?
Games of this type exercise forward planning and the ability to hold several possible futures in mind at once. You are evaluating not just your move but the reply it invites, which is working memory and inhibition working together.
Planning practice of this kind is examined in research indexed by the National Library of Medicine.
The honest caveat is that gains are largely specific to the skill you practise. Research on cognitive training transfer found that transfer to unrelated tasks is real but usually modest, so treat these as focused practice rather than general brain training.
Tips to Improve Your Four in a Row Score
Take the centre column early, since it participates in more possible lines than any other. Watch for your opponent building three with an open end and block before completing your own threat. Look for double threats, where one move creates two ways to win, because those cannot both be blocked. Count rows carefully in the diagonals, which is where most missed wins happen.
Frequently Asked Questions
Who wins if both players play perfectly?
With perfect play the first player wins on a standard seven by six board. In practice games are decided by who spots a double threat first.
Why is the centre column important?
It appears in more possible four in a row lines than any other column, so occupying it early gives you more ways to win and denies them to your opponent.
What is a double threat?
A move that creates two separate ways to complete a line. Your opponent can only block one, so it wins on the following turn. Building towards one is the core winning idea.
Where do most players miss a win?
In the diagonals. Horizontal and vertical lines are easy to see, but diagonal threats are routinely overlooked by both players.
Can the game end in a draw?
Yes. If the board fills with no line of four, the game is drawn. This is uncommon between players of uneven skill and more likely between two cautious players.