Two-Player Games (Tic-Tac-Toe, Gomoku, Connect Four)

Tic-tac-toe, Gomoku and Connect Four for two players taking turns on one screen. Play with a friend or against the computer.

How to use

1. Choose "Tic-tac-toe", "Gomoku" or "Connect Four" from the tabs at the top.
2. Under "Opponent", choose "Two players, one screen" or "Computer". For tic-tac-toe and Connect Four, also choose the "Computer level".
3. Tap a square or a column to play. With a keyboard, move with the arrow keys and press Enter.
4. When a game ends, press "New game". Press "Swap who starts" to change the first player. Wins are added to the scoreboard.

How it works

• To win, line up three marks on the 3 × 3 tic-tac-toe board, five or more stones on the 15 × 15 or 19 × 19 Gomoku board, or four discs on the 7-column, 6-row Connect Four board.
• Gomoku uses free-style rules with Black first; the forbidden moves of Renju are not applied. The Gomoku computer uses a simple pattern evaluation and plays at a beginner level.
• For Gomoku on a phone, use "Zoom" and switch on "Preview the spot and tap again to confirm" to avoid misplaced taps.
• The games in progress and the scoreboard are saved in this browser.

Questions and answers

Can you always win at tic-tac-toe?

No. If both players make no mistakes, tic-tac-toe always ends in a draw. The computer on "Hard" never loses, so choose "Easy" or play a friend if you want to win.

Are there forbidden moves in this Gomoku?

No. It uses free-style rules, so there are no forbidden moves. Either player wins by lining up five or more stones first.

What are the rules of Connect Four?

When you choose a column, your disc drops to the lowest empty space in it. The first player to line up four discs across, down or diagonally wins, and a full board is a draw.

Can two people play on one device?

Yes. Choose "Two players, one screen" and take turns. The current turn is shown above the board, and wins and draws over several games are kept on the scoreboard.