Name
connect-four — be first to connect four checkers in a line.
Rules
- Board is 7 columns × 6 rows. Checkers drop from the top and stack from the bottom.
- Players alternate turns. First to align four in a row — horizontally, vertically, or diagonally — wins.
- If the board fills with no winner, it's a draw.
Playing over WhatsApp
- Whoever starts the game is Red and drops first; your friend is Yellow.
- After each drop, tap
Send on WhatsApp. Your friend opens the link, sees your checker outlined, drops theirs, and sends a link back.
Copy link works for any other messenger.
Controls
- Tap / click the arrow above any column to drop your checker there.
↻ new game resets the board.- Use the
Mode selector to play the AI or pass-and-play locally. ↶ undo is available in those modes.
Difficulty (vs AI)
- Easy — AI searches depth 2 (1 full ply + reply). Beatable by a novice.
- Medium — depth 4. Exploits obvious traps.
- Hard — depth 6. Uses alpha-beta pruning and center-weighted evaluation. Tough.
Strategy
Control the center column first — a checker there belongs to four winning lines. Watch for "odd threats" on row 1, 3, 5 if you move first.