Goishi: Black & White Puzzle

Solve by logic, not by luck

Free · In‑App Purchases

Shade every cell black or white so each color connects, with no 2×2 blocks. Every board solves by logic alone; hints show the next forced cell and why. Connect black and white, each in one unbroken group. Goishi is a logic puzzle where you shade every cell of the board black or white. No guessing needed: every board is built to be solved by pure deduction. 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 luck. FEATURES • Hints that explain why: see the next forced cell and the reason (the 2×2 rule, connectivity, or look-ahead). A wrong stone is pointed out and removed • Logic-only puzzles: every board is checked to be solvable without guessing • Four levels: Easy (6×6), Medium (8×8), Hard (10×10), Expert (12×12). Hard and Expert test your look-ahead • Daily Puzzle: one puzzle per date, with a day streak • Ranks: climb from 10 Kyu to 9 Dan. Harder boards raise your rank faster • Resume: unfinished boards are saved automatically • Stats: puzzles solved, day streak, no-hint rate, total time, best and average times by level • Board themes: Washi, Kaya and Sumi • Drag to shade several cells, with optional highlighting of 2×2 rule breaks GREAT FOR • Fans of Nurikabe, Sudoku and other pencil puzzles • Anyone looking for a brain teaser without numbers • Players who prefer a calm, focused game to flashy effects • A daily habit before bed or on the commute PRIVACY • No account needed • Your records stay on your device • No tracking • Puzzles play fully offline Note: the app reads public App Store information to show our other apps.

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Now optimized for iPhone Duo and iPad. Minor improvements.

Version 1.1

The developer, torankirite, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

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    Accessibility

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    Information

    Seller
    torankirite
    Size
    1.3 MB
    Category
    Puzzle
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    Languages
    English and Japanese
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    © 2026, Torankirite
  • Developer Website
  • Privacy Policy

    • More by torankirite

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