FourLine

How to Play

1. Pick single-player vs AI or two-player local.
2. Click a column to drop your disc; it falls to the lowest empty slot.
3. Players alternate turns. Plan ahead to set up multi-way threats.
4. The first to align four discs in a row in any direction wins.
5. If the board fills with no winner, the round is a draw.

Features

• Three AI difficulty levels
• Two-player local mode
• Move undo
• Round and match scoring
• Touch-friendly column targeting

Tips and Strategy

• The center column is the most valuable — take it whenever possible.
• Create double threats so your opponent cannot block both.
• Block your opponent's three-in-a-rows immediately, even at a cost.
• Think a few moves ahead — especially about diagonal threats people often miss.

About FourLine

FourLine looks simple — pick a column, drop a disc — and yet it hides surprisingly deep tactics: double threats, vertical traps, and the always-tricky diagonal four.

Single-player mode lets you train against three AI strengths. Local two-player mode is great for couch matches with a friend or family member. Move undo means no game is ruined by a mis-click.

Privacy first

FourLine respects your privacy. We do not require a sign-up to play, we minimize the data we collect, and we are transparent about cookies. See our Privacy Policy for the full details.