Derivestep Mathdoku

Over 25 hours of puzzles, free and ad-free. You decide how much gets explained — from step-by-step reasoning to an empty grid with no hints at all.

Derivestep Mathdoku teaches you logic puzzles — it doesn't solve them for you.

Instead of just revealing the answer, Derivestep explains the method behind each move: which technique applies here? Why does this cage force exactly this number? Staged hints (nudge → deduction → move) move you forward without doing the thinking for you.

Mathdoku / Calcudoku is a Latin square with arithmetic cages (+, −, ×, ÷) — like Sudoku, except the cages have to be worked out. Choose size (4×4 to 9×9), difficulty, operations and help level.

Play it your way. Five settings decide how much the app prepares, shows and explains: appearance light or dark, candidates pre-filled or an empty grid, help level from detailed to none at all, timer visible or hidden, highlights on or off.

240 puzzles plus a daily puzzle — over 25 hours of puzzle time, free permanently and with no ads. A fresh puzzle every day, and your streak runs with it.

Want more? The puzzle generator. Generate endless puzzles just the way you like them — size, difficulty and operations on your terms, right on your device. Available as a yearly subscription; everything else stays free.

Features

• Reasoning & techniques instead of bare solutions
• Staged, learning-oriented hints
• 240 puzzles + a daily puzzle — free permanently, no ads
• Five settings for your way of playing — light or dark, hints detailed to off
• A daily streak — keep it going day after day
• Puzzle generator: endless new puzzles on your terms (yearly subscription)
• Progress & statistics stored locally on device
• Offline-first — no account needed

Privacy: offline-first, no ads, no device/personal data. The optional anonymous statistics can be turned off at any time (see the privacy policy). Terms of Use: https://derivestep.com/terms-en.html