Agree on the two human sides
This variant lets two people share a screen. X starts, then O is placed by another human action. There is no computer inserting an O after every X and no invitation link connecting two phones. You do not need names, accounts, chat, or an online room. The game tracks the current symbol, not the identity of the person touching the device.
Decide who controls each mark before starting. Pass the phone or take turns using the screen. The turn label tells you which symbol the next valid choice will place. If the person usually controlling X taps during O’s turn, the game still places O. It cannot verify whose hand made the action, so a clear agreement remains part of playing together.
Select a column, not a floating square
The board has six rows and seven columns. A chosen column receives a piece in its lowest free position. You cannot suspend a mark higher up, jump over an empty space, or replace a piece already on the board. Selecting a square within a column chooses that column; gravity determines where the new piece actually lands.
A full column cannot receive another piece. An invalid action does not place a mark or advance the turn. Check the top of a column before choosing it, especially when looking at a potential connection halfway up the board. A square that would finish your idea is not necessarily reachable on the next move merely because it is empty.
Recognize the four winning directions
Four consecutive Xs or four consecutive Os win horizontally, vertically, or diagonally. Four pieces scattered around the board do not count, and pieces from both sides do not combine into one line. If all forty-two spaces fill with no winning line, the round is a draw. You cannot keep adding marks after a winning line has already ended it.
After each valid move, consider what the other person could complete next. For a horizontal threat, verify that its finishing square is the landing position of a playable column. A diagonal needs the same check. A gap above several empty spaces may need supporting pieces before it becomes an immediate threat, even if the drawing looks almost complete.
Pause and review without changing turns
Pause hides the board, and Continue restores the same state and symbol’s turn. It does not start another round or place a piece while nobody is looking. You can use the pause to discuss a possible line before making the next selection. The placed-piece counter describes board actions; it is not a measure of who is thinking faster or playing more intelligently.
Undo can return to an earlier position in this variant. Agree beforehand whether you want that tool for practice or prefer to finish a round without taking moves back. An alternative continuation explored after undoing does not change the result of the original sequence. Keeping those two experiences separate makes discussion clearer when a tactic depends on a particular reply.
Save on the shared device
When browser storage is available, this variant saves separately from the computer game. It does not synchronize a remote match between devices or store participant identities. A warning means you can continue playing but should expect to lose the state when leaving. Clearing site data can also remove the local save. No account is created to restore it elsewhere.
Keyboard users can move among square buttons with arrow keys and choose with Enter or Space. On a narrow screen, scroll the board frame sideways instead of shrinking every target. Check the turn symbol after loading saved progress or handing the device to someone else. A resumed board may already contain marks and should not be treated as a fresh opening.
Finish a round and choose who starts next
When a line wins, look at the four actual marks and the choice that made their final square playable. To alternate the starting person, swap who takes X and O for the next round; a new board still starts with X. New game asks for confirmation before replacing only this variant, without clearing the other games’ saved progress.
This page does not promise a winning opening or an opponent who will ignore your threats. Its purpose is a real board with human turns and readable rules. The guide explains worked decisions, while the main game provides a locally calculated opponent when another person is unavailable. Keep those formats distinct so both players know who is choosing every mark.
Frequently asked questions
Does this connect two phones?
No. It is local two-player play on one shared device.
Does O move automatically?
No. Every mark requires a human action on the correct turn.
Can I choose the landing row?
No. Choose a column; the piece lands in its lowest free space.
Does a full column consume the turn?
No valid piece is placed and the turn does not advance.
How can we alternate the starting person?
Swap who controls X and O between rounds. A new board starts with X.