Four in a Line

How to play

Click a column to drop your token into the lowest empty slot. You and the opponent take turns — use "Online friend" for invite-link play with yellow (host) vs red (guest), or play the AI with three difficulty levels. First to four in a row wins.

Tips & strategy

The centre column is the strongest — every winning line on the board passes through the middle three columns. Always threaten two wins at once; the AI can only block one. Watch for "7" and "L" double-threat patterns.

Good for

• A solid strategy game for two children to share.
• Short enough for a lunchtime match.
• Good first puzzle for learning look-ahead thinking.

Frequently asked questions

How strong is the AI?

Easy plays any legal move, Medium always blocks and takes wins, Hard uses an alpha-beta search several moves deep — it will punish most mistakes.

Who goes first?

You (yellow) always move first against the AI. Online, the host plays yellow and moves first.

How does online work?

Create a room and share the link. Turns stay on the server for seven days after the last move — play when you are both free.

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