三目並べ - 無料2人プレイ三目並べ：ビッグボードとアルティメットモード

Tic Tac Toe Online: One Classic Game, Four Boards

Foony Tic Tac Toe is a free online tic tac toe game with private rooms you share by link, five bot difficulty tiers, and four boards in one room: the classic 3x3 grid, big 5x5 and 7x7 boards, and Ultimate Tic Tac Toe. Marks draw themselves onto the board with quick pen-stroke animations, your next move previews under the cursor, and the winning line strikes through the grid the moment it lands. Neither an account nor a download stands between you and the board; the page loads straight into a lobby and you are one click from a game.

The classic 3x3 game is the most-searched board game on the internet for a reason: anyone can learn it in ten seconds. The problem is that two players who both know the trick will draw forever. That is exactly the problem this page solves. When 3x3 stops being a contest, the host flips one lobby setting and the same room is suddenly playing a game with real strategic depth.

Tic Tac Toe 2 Player: Friends, Rivals, or a Full Room

The default match is tic tac toe 2 player, X against O, head to head. Click "Play with Friends", share the room link, and your opponent joins from whatever browser their phone, tablet, or desktop already has. The turn timer defaults to 15 seconds per mark, which keeps games brisk; the host can stretch it to a full minute or switch it off entirely.

No friends online? The room seats bots at five difficulty tiers: Easy, Novice, Skilled, Expert, and Unbeatable. Easy plays nearly at random. Skilled punishes any blunder it can see. Unbeatable searches the entire 3x3 game tree, so a draw is genuinely the best result you can get against it, and on the bigger boards it looks far enough ahead to make you work for every line. Solo wins against bots award XP scaled to the tier you picked, so beating Unbeatable pays roughly twice what farming Easy does.

Rooms also scale far past two seats. Extra players join team X or team O and rotate turns round-robin within their team, so a 3 player room, a family, or a whole classroom can play one shared board without anyone sitting out.

Pick Your Board: 3x3, 5x5, 7x7

The host chooses the board in the lobby, and the win condition grows with it:

The longer win lines are not arbitrary. Game theorists study these as m,n,k-games, and 4-in-a-row on 5x5 and 5-in-a-row on 7x7 are the standard values that keep the first player from winning by force while still letting an aggressive player end the game decisively. Big tic tac toe boards turn the game from a memorized ritual into something closer to a miniature m,n,k-game like gomoku, where reading threats matters more than knowing one opening.

Ultimate Tic Tac Toe: Nine Boards, One Win

Ultimate Tic Tac Toe (players also call it super tic tac toe) is the variant that turned this genre into a genuine strategy game. Nine 3x3 boards sit in a 3x3 macro grid. Win a small board and you claim that square of the big grid; claim three big squares in a row and you win the match.

The twist is the routing rule: whichever cell you mark inside a small board, your opponent must make their next move in the small board at that same position. Play the top-right cell of any board and your opponent is sent to the top-right board. If the board you would send them to is already decided, they get a free choice instead. Every move is therefore two decisions at once: a tactical one (this board) and a strategic one (where you exile your opponent next). Foony highlights the board you are locked into with a gold glow, so the rule that scares people off paper versions becomes self-explanatory after one game.

How to Play Tic Tac Toe

X always moves first. Click or tap any empty cell to place your mark; legal cells preview your symbol on hover. Players alternate until someone lines up enough marks in a row horizontally, vertically, or diagonally: three on the classic board, four on 5x5, five on 7x7. Fill the board with no winner and the game is a draw, traditionally called a cat's game.

On the classic board, that draw is not bad luck but mathematics: tic tac toe is a solved game where perfect play by both sides always ends in a tie. Noughts and crosses, as the same game is known in the UK, has been used to teach game trees to beginners for decades precisely because the whole game fits in your head. The bigger Foony boards exist for the moment it starts fitting a little too comfortably.

Tic Tac Toe Strategy That Actually Wins Games

On 3x3, take the center if you can and a corner if you cannot; edges are the weakest opening response. Against an opponent who opens in the corner, answering in the center is the only reply that does not lose to perfect play. From there, the only winning trick that works on humans is the fork: create two lines of two at once, so blocking one hands you the other.

On 5x5 and 7x7, forks stop being a trick and become the entire game. An open-ended run of three (both ends free) is already a fork, because it completes on either side. Build your marks in loose diagonal clusters that threaten several lines, and block an opponent's open three the turn it appears, not the turn after.

In Ultimate, the routing rule outranks the boards themselves. Avoid moves that send your opponent to the center board early, since the center board feeds lines in every macro direction. Sending them to a board that is nearly decided wastes their turn, and late in the game, handing someone a "free choice" by routing them to a dead board is often worse than giving them a specific bad board.

Leaderboards and Achievements

Every match feeds the Tic Tac Toe leaderboards, filterable by day, week, month, year, or all-time. The Tic Tac Toe achievements stay light for the quick boards (First Scribble for finishing your first game, Cat's Game for playing out a draw) and save the bragging rights for Ultimate: Ultimate Champion for winning a game of it, and Total Control for winning without your opponent claiming a single small board. Wins, losses, and even draws also pay Foony coins and account XP that carry across every game on the site, so a few quick boards between matches of something heavier still move your account forward.

From Three in a Row to Four

If the "line them up" itch outlasts the board, the natural next step is 4 in a Row Connect, where gravity stacks your pieces and the vertical dimension changes every threat, or Checkers when you want captures on the same 8x8 battlefield energy. Same rooms, same account, same one-click start.