Sudoku Meets Math.

Calcudoku (KenKen) — a logic puzzle that combines Sudoku rules with arithmetic. Fill the grid. Solve the cages. Train your brain.

Infinite puzzles · Daily challenges · Global leaderboards · No ads

App Store Download APK

What is Calcudoku?

You may know it as KenKen® — the puzzle invented by a Japanese math teacher. It appears in The New York Times, The Guardian, and puzzle books worldwide.

                        Think Sudoku + Arithmetic.

                        Fill each row & column with unique numbers, while matching cage targets using +, −, ×, ÷.

Easy to learn, endlessly challenging. From 3×3 warm-ups to brain-melting 9×9 grids.

7+1

2−4

3÷3

3−4

12×2

5+3

7+3

A solved 4×4 puzzle

Why Foxy Cages?

Six reasons to ditch your old puzzle app.

♾️

Infinite Puzzles

Our engine generates unique puzzles on the fly. You'll never run out — literally.

📅

Daily Challenge

A new puzzle every day. Same puzzle worldwide. Compare your time with everyone.

🏆

Global Leaderboard

Compete with players around the world. Climb the ranks. Earn your spot at the top.

🚫

No Ads. Ever.

Zero banners, zero pop-ups, zero interruptions. Just you and the puzzle.

💡

Smart Hints

Stuck? Get a subtle nudge — not the answer. Designed to help you learn, not cheat.

📱

iOS + Android

Available on the App Store and as a direct APK download. Play anywhere.

📦 Android: Direct Download

Foxy Cages is not yet on Google Play. You can safely download the APK directly from this site.

How to Install

Tap "Download APK" below (or at the top of this page).
When prompted, allow your browser to install apps from unknown sources.
Open the downloaded app-arm64-v8a-release.apk file.
Tap Install. Done! Launch the app and start solving.

🔒 Signed APK — verified by developer key

📏 ~19 MB — lightweight

🏷️ v1.0 — latest release

Why not on Google Play? We're a small indie team and are preparing for Google Play release. In the meantime, this direct download is the same signed release build.

Download APK (arm64)