Stack4 rules
Empty 7×6 grid
Overview
Stack4 is Connect Four-style: drop discs into columns and connect four in a row. Player 1 (yellow) vs Player 2 (red); Player 1 starts.
Objective
Connect four of your discs horizontally, vertically, or diagonally before your opponent. Or win by resignation or timeout.
Game setup
Empty board, seven columns (A–G or 0–6), six rows. Player 1 is yellow; Player 2 is red.
Four in a row wins
How to make moves
Click a column on your turn. Your disc falls to the lowest empty cell. Full columns are illegal.
Wins are detected immediately after each drop — your opponent does not get a reply move once four connect.
Edge cases
Draw
All 42 cells filled with no four-in-a-row.
Move replay
Review column drops in finished games.