Choose a column on your turn. The piece drops to its lowest free space; four consecutive marks of one side win.
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Choose a numbered column button; no dragging is needed. Press Tab, then use Left, Right, Home, or End to move between buttons. Enter or Space drops a piece. Escape pauses. On small screens, the seven buttons wrap onto two rows.
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Choose one of seven columns. Your X piece falls to the lowest available space, then the local computer drops O. Connect four pieces horizontally, vertically, or diagonally. Full columns cannot receive a piece. This version is against a local computer, with no online opponent. Arrow keys, Home, and End select a column; Enter or Space drops a piece. Pause hides the board and saves the game.
This version uses seven columns and six rows, for forty-two spaces. X and O distinguish the sides. In the main game, you control X and a local computer replies with O after a valid human action. The separate same-device two-player variant requires a human action for both symbols. Check the chosen format before assuming who makes the next move.
The rules do not depend on calling a side red or yellow. A square’s mark identifies its owner. There is no account, chat, or remote room attached to the computer board. The opponent calculates its response locally. In a shared game, the turn symbol alternates, but the software cannot identify which participant physically touched the screen.
Choose a column rather than an arbitrary empty square. A piece falls into that column’s lowest free space. The next piece in the same column rests above it. You cannot float a piece in a higher row or skip an open position below. This gravity rule matters whenever a potential winning gap sits above the bottom row.
A column containing six pieces is full and cannot accept another. An invalid full-column choice does not add a piece or consume a valid turn. If a control seems inactive, check whether the column is full or the board is paused before repeatedly selecting it. Repeated input cannot create another space in an already completed column.
A winning line contains four consecutive marks from the same side, horizontally, vertically, or diagonally. A diagonal advances one row and one column at each step. Pieces separated by an empty gap or by the other side’s mark do not form the required line. Four marks in unrelated places do not add up to a win.
The result is checked after a valid piece lands. Once a line wins, the round ends; the other side does not continue to see whether a later move would also have connected four. If the entire board fills without a winning line, the result is a draw. It is not awarded to the side with a more attractive-looking pattern or a different perceived score.
Three pieces with an empty fourth position may suggest a threat, but it is immediate only if that gap is the next landing space of its column. Three adjacent Xs on the bottom row can finish with a neighboring bottom-row X when that column is empty. An elevated horizontal or diagonal may need supporting pieces first.
Apply the same check to defense. If O has a reachable finish next turn and you cannot win now, a block deserves attention. Also notice what your own move makes available above it. Filling the square below an opponent’s winning gap can provide exactly the support the opponent needs. That consequence follows the same gravity rule rather than changing it unexpectedly.
Pause hides the board, and Continue returns to the same position. When browser storage is available, this game can be saved on the current device. It is not a cloud account or a match synchronized to another phone. If saving is blocked, the notice warns that you can play but will lose this state when leaving. Clearing site data can remove it as well.
New board asks for confirmation before replacing the current round. Cancel keeps it; confirm prepares an empty board with X starting. The other games keep separate saved progress. Opening the two-player variant does not turn a computer game into an online room or automatically transfer its marks to a different format.
The main board provides numbered column controls, so you do not need to drag a piece. They may wrap onto two rows on a small phone while still representing the same seven columns. With a keyboard, use Tab to reach them, arrow keys or Home and End to move, and Enter or Space to drop. Escape pauses the game.
These rules explain legal actions and how a result is reached. They do not promise a win for always opening in the center or certify that this local opponent plays a mathematically perfect strategy. Use the guide for worked threats and blocks once the mechanics are clear. First make sure you can identify a valid landing position, a full column, a reachable threat, and the point when a round has ended.
Six rows and seven columns, with forty-two spaces.
No. A piece always falls to the lowest free position.
Yes. Four consecutive marks of the same side also win diagonally.
The round is a draw.
Not in that round. Start a new board to play again.