GridLab

Design Sudoku Puzzles to Print

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

iPad

Create advanced Sudoku puzzles, X, Anti-King, Anti-Knight, Hyper. Export to PDF, PNG, SVG and ePub. Solve on paper, away from the screen. GridLab creates Sudoku puzzles designed to be solved by hand. On paper. On wood. On e - ink. It's not a game. It doesn't teach, hint, or guide. It prepares puzzles, then steps aside. ▸ ADVANCED VARIANTS Each puzzle freely combines one or more geometric constraints: • Classic: the standard rules • X-Sudoku: both main diagonals must also contain 1 - 9 • Anti-King: no equal numbers in diagonally adjacent cells • Anti-Knight: no equal numbers at a chess knight's move distance • Hyper Sudoku: four additional 3×3 boxes overlaid on the grid Constraints combine freely: a puzzle can be X-Sudoku and Anti-Knight at the same time. ▸ UNIQUENESS GUARANTEED GridLab mathematically verifies that every puzzle has exactly one solution before finalizing it. No ambiguity, no flawed designs. ▸ COGNITIVE PROPERTIES Each puzzle explicitly declares: • Logical depth: how many consecutive deductive steps it requires • Information density: how many given cells and how they're distributed • Need for assumptions: pure deduction, or controlled trial - and - error • Bottlenecks: points where one wrong choice compromises the entire solve ▸ EXPORT • PDF: collection of diagrams, usable with Apple Pencil on iPad • PNG: for quick printing or replication on physical materials • SVG: for laser cutting, wood engraving, craft applications • ePub: puzzle collections for e-ink devices With "Include solutions": solutions are appended at the end of the document, separated by a title page, for personal review after solving. ▸ VERIFICATION After solving on paper, enter your result in the app for a direct comparison. No guided explanation. Just: valid or invalid. ▸ NO GAMIFICATION No points. No levels. No badges. No notifications. No ads. No subscriptions. GridLab is built for those who want to work with their mind. Not for passive entertainment. ▸ BUILT-IN GLOSSARY The Glossary section explains each variant with animated mini-grids and documents the cognitive properties of every puzzle. ▸ SUPPORT THE PROJECT GridLab is free and collects no data. If you find value in the app, you can support development with a one-time voluntary purchase from the "Support" section.

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    Information

    Seller
    • MERCURIO SAS DI INFANTE LUCA & C.
    Size
    • 8.6 MB
    Category
    • Productivity
    Compatibility
    Requires iPadOS 26.2 or later.
    • iPad
      Requires iPadOS 26.2 or later.
    • Mac
      Requires macOS 26.2 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 26.2 or later.
    Languages
    English and 2 more
    • English, Italian, Spanish
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 Mercurio Solutions
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More

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