Classic picross logic puzzles.
Numbers around the edge tell you the runs of filled squares in each line. Work out which is which and a picture emerges from the grid. Pure deduction — there is nothing to guess, and nothing you need to know in advance.
An Android app. iOS is in development, with no date yet — get an email when it lands.
The numbers beside each row and column are the runs of filled squares in that line, in order. A row marked "4 2" has a run of four filled squares, then at least one gap, then a run of two. Where those runs sit is what you work out.
You mark the squares you know are filled and cross out the ones you know are empty. Crossing out is not optional bookkeeping — on the larger grids it is where most of the progress comes from, because an eliminated square constrains every run that could have covered it.
The puzzle is done when every filled square matches its row and column clues. What is left is a picture.
Difficulty is grid size — and which techniques that size demands.
A bigger grid is harder for two compounding reasons: there are more lines to track, and each line is longer, which means the clues constrain a smaller share of it. Overlap does less work on a 15-cell line than on a 7-cell one.
| Tier | What it is | What that changes |
|---|---|---|
| Easy | 7×7 | Clues are large relative to the line, and much of the grid falls straight out of overlap. |
| Medium | 9×9 | Overlap still opens the grid, but edges and crossing lines start mattering. |
| Hard | 12×12 | The early grid is sparse. Progress comes from crossing out and splitting lines into segments. |
| Expert | 15×15 | Segment reasoning throughout, alternating rows and columns to make headway. |
Two hundred puzzles to start — fifty in each of the four difficulties.
Extra puzzles come as packs, sold one at a time. There is no bundle you have to buy to get a fair deal, no "unlock everything" upsell, and no subscription — you buy the pack you want and nothing else.
| Easy pack | 50 puzzles | $1.99 |
|---|---|---|
| Medium pack | 50 puzzles | $1.99 |
| Hard pack | 50 puzzles | $2.49 |
| Expert pack | 50 puzzles | $2.99 |
Purchases are tied to the account you sign in with, so they survive a reinstall or a new device. Prices are US dollars; your local store will show its own.
Not fewer ads, not optional ads, not a "rewarded" video in exchange for a hint. There is no advertising code in the app at all, so there is nothing to interrupt you, nothing to accidentally tap, and nothing that starts appearing later once you are invested.
The Android advertising ID is absent from every one of our binaries, and none of them asks permission to read it. The Google library that can read it is not in the build at all. That is checked automatically on every release build before it ships — it is a property of the artifact, not a promise in a policy.
No name, no email address, no phone number, no contacts, no location. When you sign in, the platform offers the app your display name and avatar; the app never reads them.
Your identity with us is a one-way salted hash, computed separately for every game. The same person playing two of our games is two unrelated IDs, and we could not connect them if we wanted to — we removed the ability rather than promising not to use it.
No subscriptions. No expiring content. No energy timer, no "come back tomorrow", no currency to top up. You buy a puzzle pack and it is yours, on every device you sign in from.
Anonymous gameplay measurements: how long a puzzle took, whether it was finished, how many hints it needed. We use them to check that a puzzle labelled Hard is actually hard. Saying that plainly is stronger than implying nothing is measured — the privacy policy spells out every field.
You should not have to take our word for any of it. See the receipts