Goishi: Black & White Puzzle

Connect black and white—each in a single, unbroken area. Goishi is a logic puzzle where you shade every cell black or white. Just three rules, endless depth. THREE SIMPLE RULES - Shade every cell black or white. - All black cells connect; all white cells connect. - No 2×2 square may be a single color. Every puzzle has exactly one solution—reached by reasoning, not guessing. HINTS THAT SHOW WHY When you're stuck, Goishi reveals the next forced cell and the reason: "fixed by the 2×2 rule" or "fixed to keep a color connected." You stop guessing and start seeing. It's the satisfaction of understanding, not just finishing. FOUR LEVELS + A DAILY PUZZLE - From Easy (6×6) up to Expert (12×12). - A fresh Daily puzzle every day, with a running streak. - Puzzles are generated on device, so boards rarely repeat—and the twistier they get, the more rewarding the connections. QUIET AND BEAUTIFUL Go stones and washi paper, ink and indigo. No flashy effects, no noise. Each stone settles the board a little more. Perfect for a commute or the last minute before sleep. SEE YOURSELF IMPROVE - Solved count, day streak, no-hint rate, total play time. - Per-difficulty best and average times, top-3 times, and a daily-achievement calendar. A CLEAN, PRIVATE DESIGN - No third-party advertising SDK. - No account. Your data stays on your device. - No tracking. Works fully offline. Just you and the puzzle. FOR YOU IF… - You love reasoning puzzles like Nurikabe or Sudoku. - You want a brain teaser that needs no numbers. - You prefer calm apps without ad bombardment or constant connectivity. - You enjoy a small, satisfying daily habit. Connect black and white. Start with today's puzzle.