CalmChess is an offline Gomoku utility designed for gentle brain training and quiet leisure. No internet. No account. No ads. Open the app and place stones against the computer on a clean 15x15 board. Each session helps you practice focus, observation, and logical thinking. Connect five stones in a row horizontally, vertically, or diagonally to complete the challenge. Key Features Practice vs Computer You place Black stones first. The built-in AI responds as White with thoughtful moves, ideal for daily mental exercise and light challenges. Undo and Restart Made a slip? Tap Undo to reverse your move and the computer's last stone. Want a fresh approach? Restart clears the board instantly. Bilingual Interface Full support for English and Simplified Chinese. Switch languages from the top-right corner. Your preference stays on your device. Truly Offline No network required. No in-app purchases. No personal data collection. Session data lives only in memory and is cleared when you quit. Thoughtful Design Light, easy-on-the-eyes layout with large tap targets and clear status messages for users of all ages. CalmChess believes brain training need not be noisy. We hope each quiet session brings you clarity and calm. App feedback: Leave a review on the App Store