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Four Fern

One column. Two plans. Four together.

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This replaces the current run. Your best score stays.

How to play Four Fern

Drop your discs into seven columns and connect four horizontally, vertically or diagonally. Fern moves first; Clay answers. Play the computer, share the device with a friend, or solve six short tactical positions.

  1. Every disc falls to the lowest open space in its column. A full column cannot accept another disc.
  2. Try puzzles opens six separate tactical positions. Make four within one or two Fern drops; Clay replies between your moves. Retry applies the selected puzzle without resetting your saved match or solved positions.
  3. The first four-disc line wins immediately. If all 42 spaces fill without a winning line, the match is a draw.
  4. Choose the opponent for your next game, then use New game. Changing this selection does not interrupt the current match.

Controls at a glance

Touch or mouse
Tap a numbered column button to drop a disc. In friend mode, pass the device after each move.
Keyboard
Tab to a column button. Left and right arrows move between columns; Enter or Space drops a disc.

A few things worth trying

  • Look for your own winning move before blocking. An immediate four ends the match even if your opponent also has a threat.
  • The center column participates in more possible lines. It is often useful, but a direct threat matters more.
  • Watch diagonals supported by future moves. Placing a disc can create the landing space your opponent needs.

Good to know

How does the computer play?

It searches several moves ahead and scores possible lines. It takes immediate wins and blocks direct threats when possible. It is not claimed to play perfectly.

Can two people play?

Yes. Choose Friend on this device for the next game, then start a new match. Both players use the same column controls.

Will a refresh keep the match?

The exact move history, opponent mode and match totals are kept in this browser. If the computer was due to move, it resumes after reload.

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