Five in a row

Gomoku

CaroFive in a row

The classic Vietnamese board game, rebuilt for your phone: quick online matches, room codes for friends, an AI that bites back, and a board that looks as good as your five feels.

Download on theApp Store Get it onGoogle Play

See how it plays

Free
No ads
No in-app purchases
Plays offline vs AI

01 — The board

Win in style

Exactly five wins. Six in a row doesn't. A five blocked at both ends doesn't either — proper Vietnamese caro, straight out of the box. Prefer freestyle? Flip one switch.

Exactly five
Six or more doesn't count
Blocked at both ends doesn't count
Freestyle toggle

See the threat before it lands

Threat highlights mark open threes and fours so the game is decided by reading, not by blinking.

Hints when stuck, coordinates when serious

Ask for a hint, turn on coordinates, pinch to zoom on the big boards.

15×15, 19×19, or Growing

The Growing board expands as you play, up to 50×50. Win length 4 to 9. Turn clock 15, 30, 60 seconds or off.

02 — Online

Play online with anyone

Tap Find an opponent and you're matched in seconds. Or share your code — something like NANG-3184 — so a friend can invite you. Whoever gets the invite has 30 seconds to say yes.

Invite friends with a codeNANG-3184MIA-4827

Type it however you like — lowercase, no dash, extra spaces. It still works.

👍
😂
😮
😢
🔥
🤝

Six emoji reactions, no chat, no drama

Every move checked by the server

No desync, no arguing. The server is the referee.

Drop your connection? Reconnect.

Get back in and pick up exactly where you left off.

Draw, undo, resign

Offer a draw, ask to take a move back, or resign gracefully — all one tap.

An Elo rating that follows you

Everyone starts at 1200. Link Google or Apple and it survives a new phone.

03 — Solo

4 AI levels — try Insane

From a bot that only blocks the obvious to one that thinks for a second and a half on every single move. Minimax with alpha-beta pruning, iterative deepening and threat-space search — the same ideas serious engines use, tuned for a phone.

Easy
Blocks the obvious and misses the rest
Medium
Sees threes and fours, one move ahead
Hard
Looks four moves ahead and hunts forced wins
Insane
Thinks for a second and a half, every move

Minimax · alpha-beta · iterative deepening · threat-space search

Opponent sitting next to you? Pass-and-play on one device.

04 — Look

3 stunning themes

Neon Ink, Paper & Ink, Retro Arcade. All three free, all three built to be stared at through a long, tense endgame.

Neon Ink
Dark and luminous
Paper & Ink
Light, brush on paper
Retro Arcade
Phosphor and scanlines

All free

High contrast, reduced motion and screen-reader labels are built in. Pinch to zoom on big boards.

The Gomoku app showing a won game on the Neon Ink board

05 — Get it

Free on iOS and Android

No ads, no in-app purchases, no push notifications. Just the game — in English or Vietnamese, switchable any time.

Download on theApp Store Get it onGoogle Play

Review every move

Full match history with move-by-move replay.

Daily puzzle

140 puzzles and a streak worth protecting.

English and Vietnamese

Switch in a tap. Everything is translated, not just the menus.