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Welcome to COSUMI! You can play 5×5 to 19×19 Go(a.k.a. Igo, Baduk, and Weiqi), which is a well-known ancient board game. Move consists of placing one stone of one's own color on an empty intersection on the board. A player may pass their turn at any time. A stone or solidly connected group of stones of one color is captured and removed from the board when all the intersections directly adjacent to it are occupied by the enemy. (Capture of the enemy takes precedence over self-capture.) No stone may be played so as to recreate a former board position. Two consecutive passes end the game. A player's area consists of all the points the player has either occupied or surrounded. The player with more area wins.

Cosumi is available on GameBig.Net as a browser game. You can launch it when you are ready (use the green Play button below so the game only loads after you choose to play, which keeps the first view of this page lighter for visitors on slower connections).

Our editors describe each title with the official short description when provided, list the default controls, and link related games so you can discover more in the same genre. If you need help with account issues, removals, or partnerships, use the contact page so we can respond by email.

Topics and tags: Puzzle, 1 Player, Board, Turn Based, Html 5, Thinking. These labels help you find similar games from our catalog without leaving the site.

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Cosumi 125,743 plays
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About this game on GameBig.Net

Summary. Welcome to COSUMI! You can play 5×5 to 19×19 Go(a.k.a. Igo, Baduk, and Weiqi), which is a well-known ancient board game. Move consists of placing one stone of one's own color on an empty intersection on the board. A player may pass their turn at any time. A stone or solidly connected group of stones of one color is captured and removed from the board when all the intersections directly adjacent to it are occupied by the enemy. (Capture of the enemy takes precedence over self-capture.) No stone may be played so as to recreate a former board position. Two consecutive passes end the game. A player's area consists of all the points the player has either occupied or surrounded. The player with more area wins.

Audience. Titles on GameBig.Net are aimed at casual players looking for short sessions in the browser. Difficulty and themes vary by developer; use tags and related games to narrow what you like.

Fair play. Scores and achievements depend on the third-party build we embed. If something looks broken after an update, reload the page once or report the game with the flag button above.

How to play — controls for Cosumi

Follow the scheme below while the game window is focused. On desktop, click inside the game area first so keyboard input reaches the title.

  • Interact/Action
  • Fullscreen (page)

Tips for a smoother session

  • Close unused tabs and pause large downloads so the browser has free CPU for Cosumi.
  • Use fullscreen when supported for a stable aspect ratio and fewer accidental clicks outside the frame.
  • If audio is blocked, interact once with the page (Play counts) so autoplay policies can unlock sound where the developer allows it.
  • Bookmark this URL if you plan to return; the same page will list updated play counts and community rating over time.

Frequently asked questions

Is Cosumi free here?
Yes. We host a free-to-play embed on this page. Optional ads on the site may appear according to our policy and your region.
Do I need to install anything?
No app store install is required for typical HTML5 games. Flash-era titles may use in-browser emulation (Ruffle) when marked as SWF.
Can I play on mobile?
Many games support touch; some are keyboard-first. If controls feel awkward, try rotating the device or switching to a desktop browser.

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