Gomoku is a classic five-in-a-row board game where two players take turns dropping black and white stones onto a 15 by 15 grid. You can play Gomoku unblocked here against a friend on the same screen or against a computer with three strength levels. The rules fit in one sentence, but spotting threats and setting traps can keep you thinking for a long time.
The Rules in a Minute
Black always moves first, and then you alternate. Each move, put one stone on any free intersection, which is the point where two grid lines meet. Nothing ever slides, and nothing is ever taken off.
Whoever first gets five or more stones of their color touching in a straight row wins. Rows can go across, vertically, or on either slant. If the whole grid fills with no winner, the game ends in a draw. With 225 points, that is rare, but it can happen between two careful players.
How to Play Gomoku: Modes and Buttons
There are two ways to start a game:
- 2 Player (local) lets two people share one device and take turns.
- vs Computer asks you to pick a color and a level (Easy, Medium or Hard), then press New game. Choose black to go first or white to respond.
Undo takes back your last stone, and against the computer it also removes the reply, so you are back at your own turn. Resign ends the game early, with a confirmation step so you do not tap it by accident. The newest stone gets a highlight ring, and a line of text above the grid tells you who moves next.
What Each Computer Level Does
The opponent only considers points within two spaces of stones already on the board, which keeps it fast on such a large grid. Here is how the three levels differ:
- Easy picks a random nearby point. It will miss your threats and often wander off, which makes it good for learning the shapes.
- Medium always takes a winning point and always blocks a row of four. Otherwise it rates every candidate and picks one of its top three, so it is solid but a little unpredictable.
- Hard makes the same win and block checks, then searches two moves deep among its best options, with a time limit of about two seconds.
The computer’s rating rewards rows that are not blocked by your stones. A stretch with four of its stones and one empty point scores much higher than three, so it chases long, open lines. That also means it reacts strongly when you build them.
Reading the Board
Most of Gomoku is about free space at each end of a row. Three stones with empty points on both sides is called an “open three,” and it is dangerous because it can grow in either direction. A row of four that is already capped on one side is much less scary, since there is only one point left to stop.
That leads to the key idea: once your rival builds four with both ends free, you face two separate finishing points, and one stone can only cover one. Most games are decided one move before that, by whoever first makes an open three the other player ignores.
Gomoku Tips and Strategy
- Block every open three right away. Waiting even one turn can turn it into an open four, and then the game is over.
- Look for double threats. One stone that creates two separate dangers at once, such as two open threes or a four plus an open three, usually wins on the next turn.
- Play near the center. Lines there have room to stretch in every direction, while edge stones run out of space fast.
- Use gaps. A pattern like stone, stone, space, stone is easy to miss and can still be completed with one move.
- Keep your stones connected. Stones one diagonal step apart support several lines at once and make it easier to fork later.
- Take black while learning. Going first is a real edge under freestyle rules, so switch to white once you can beat Medium.
Mistakes New Players Make
The most common error is playing only on offense and missing the opponent’s three. Before every move, scan all four directions around your rival’s last stone. Another mistake is blocking a three at the wrong end: block the side that also cuts into your rival’s other lines. Finally, avoid spreading out too much. Scattered stones look busy but rarely add up to a threat.
Settings, Saving and Devices
The Settings menu includes text size, spacing, a high-contrast display and a computer speed option (Fast, Normal or Slow) that changes how long the computer waits before it moves. You can also set who moves first to Random, and turn on “Suggest difficulty,” which nudges the level up after three wins in a row or down after three losses.
Your game is saved in the browser as you play, so a closed tab does not cost you the position on the same device. Results against the computer are tracked on that device only.
On a Chromebook or laptop, clicking is fastest, but the arrow keys plus Enter work well if you prefer the keyboard. On a phone, the board fits a tall screen, and each move is one tap. Zoom in if the points feel small, and use Undo if a tap lands on the wrong point.
Similar Games to Try
If you like planning rows and blocking your opponent, these are good next picks from the board and card games section:
- Four in a Row uses a much smaller upright grid where pieces drop to the lowest open slot, so you only choose a column.
- Universal Reversi is also about placing pieces on a grid, but there you flip your opponent’s pieces instead of building lines.
- Mancala is a counting game with seeds and bowls, good if you want something calmer that still rewards thinking ahead.
A game against Easy or Medium fits into a short break, and since an unfinished game stays saved, you can stop at the bell and come back to the same position later.
