Calcudoku: Math Logic Puzzles

If you love Sudoku but are looking for a deeper challenge, or if you simply enjoy games that give your brain a real workout, Calcudoku is the ultimate logic puzzle. It combines the grid-filling deduction of Sudoku with simple arithmetic, creating a deeply satisfying balance of mental math, strategy, and problem-solving.

Whether you want to sharpen your focus, keep your mind agile during a quick break, or master complex logical deduction, Calcudoku offers endless replayability for beginners and puzzle veterans alike.

--- WHAT IS CALCUDOKU? ---
Also known as Mathdoku or KenKen®, Calcudoku challenges you to solve a grid using logic and arithmetic:

• Grid: Fill an N x N grid so that every row and column contains the numbers 1 through N exactly once without repeating. You choose the grid size to solve, anywhere from a 3x3 to a 9x9.

• Cages: Outlined groups of cells (cages) each display a target number and an arithmetic operator.

• Math: The numbers in each cage must combine using its operator (+, −, ×, ÷) to hit the target. Numbers can repeat within a cage as long as they stay in different rows and columns.

It’s the ultimate combination of mental math, pattern recognition, and pure deduction.

--- THE SMART DIFFERENTIATOR ---
Many puzzle apps ruin the fun when you get stuck by simply filling in a random cell for you when requesting help. Our app takes a different approach: it teaches you how to solve it.

If you hit a wall, our built-in helper analyzes your exact grid state and explains the logical next step. The engine guides you through genuine deduction strategies—showing you how to cross-reference overlapping cages, prune cell candidates, and leverage your notes so you can solve the grid completely on your own.

--- KEY GAME FEATURES ---
• Intelligent Explanations: Step-by-step guidance focused on note-taking, elimination strategies, and candidate pruning rather than giving away answers.

• Optional Auto-Notes: The settings tab provides the option to jump into a puzzle with the initial candidate notes based on cage arithmetic. Skip the mundane and get right to the logic!

• Smooth Input: Rapidly input answers and edit candidate notes with an intuitive, fluid UI built for mobile screens.

• Complete Arithmetic Variety: Play grids featuring addition, subtraction, multiplication, and division.

• All Skill Levels: Progress from quick 3x3 warmups to grueling 9x9 logic grids.

• Polished Interface: Full native dark mode support, crisp typography, and seamless offline play - no Wi-Fi required.

Master the grid, elevate your deduction skills, and train your brain with a game that actually makes you a better solver.