Every Pencilmark puzzle has exactly one solution and a logical path to it, confirmed by a solver before you ever see it. A daily set, a “Why?” hint that teaches the next step, no ads, no account.
Runs in your browser and works offline. iPhone and Android versions are in preparation.
A solver proves each grid has one solution and that logic alone reaches it. If a puzzle cannot be certified, it never ships. How certification works
“Why?” names the technique, shows the cells involved and explains the deduction. Three levels: nudge, reason, move.
One Star Battle, one Skyscrapers and one Kakuro every day, the same for everyone. Keep a streak with a weekly shield.
Share your time and hint use as a tiny coloured grid. No solutions, no spoilers.
No account, no ads, no analytics and no third-party requests. Your progress stays on your device.
Every technique the solver uses is explained, with real examples from the library. Learn Star Battle
Place one star in every row, column and region. Stars never touch, not even diagonally. Sizes 5×5 to 9×9.
Play and learn the rulesFill the grid with building heights so each edge clue matches how many buildings you can see.
Rules and techniquesA crossword of sums. Digits 1 to 9, no repeats in a run. The combinations chart is free.
Rules and cheat sheet
The web version is free, and the first 8 puzzles of each level in every game are included. Planned store versions add an optional one-time Plus upgrade for the full library. Free printable packs are published too: printable logic puzzles.
No. Every Star Battle, Skyscrapers and Kakuro puzzle in Pencilmark is checked by a solver that confirms there is exactly one solution and that it can be reached by logic alone. If you are stuck there is always a next deduction.
It shows the next logical step the solver would take from your current board, explains the reasoning in plain words, and only places it for you if you press Apply. Hints are counted in your result but never block you.
The web version is free with no ads. The first 8 puzzles of every level in each game are free; planned store versions add a one-time Plus upgrade for the full library. The web build takes no payments.
No account. After the first visit it works offline. Progress and your streak are stored on your device.
It stays on your device. The app makes no requests to third parties and has no analytics. You can export a backup file at any time.
Store versions are in preparation. There is no date yet. Meanwhile you can add the web app to your home screen.
Ready? Today's set takes about ten minutes.