How to play
- Place a piece where it brackets one or more opposing pieces.
- Turn every bracketed line to your color.
- Protect future mobility and value stable corner positions more than an early piece lead.
What this game practices
A deep strategy game with simple counting feedback. Early score can be misleading, making it useful for discussing short-term gain versus long-term position.
How we checked it
Open-source HTML5 game reviewed in the local coolmath build for startup, primary controls, restart flow, narrow-screen fit, console errors, failed requests, and third-party network activity. Upstream telemetry is disabled in this self-hosted copy.
Open-source license and attribution
This self-hosted game is adapted from Web Games by mashukui and distributed under the MIT License. coolmath disabled upstream telemetry and records its local changes in the open-source notices.
Reviewed by coolmath Editorial Team · Updated 2026-10-09