Help & support

At midnight UTC. Everyone in the world gets the same four puzzles that day. The home screen shows a countdown once you have finished the pack.

Finish all four daily puzzles on a day to add one to your streak. Skip a whole day and the streak starts again from one.

Each puzzle has a par time. Finish at or under par with at most one hint for 3 stars, within twice the par for 2 stars, otherwise 1 star. The brainwave score is 100 at par, higher when you are faster (up to 200), and each hint trims it a little. It is just for fun and is not a medical or IQ test.

Yes. Every puzzle is generated by our own script and then checked by a solver: Sudoku and number cross have exactly one solution, every nonogram can be finished line by line, and every logic grid can be solved from its clues alone. You never have to guess.

A hint highlights one cell (or one line, or one square of the logic grid) and explains why it must be that way. Neuro never fills in the whole puzzle for you.

Tap a square once for ✕ (no) and twice for ✓ (yes). A ✓ means the rest of its row and column in that block are ✕; with smart notes on, the game marks those for you. Tap a clue to strike it out when you have used it.

The number in the top-right of a dark square is the total of the white squares to its right; the number in the bottom-left is the total of the white squares below it. Digits 1 to 9, no repeats inside a run.

Pick a kind of puzzle and a size and Neuro builds a brand-new one on your device. There is no clock and no score.

Yes, in Settings: sound, music, vibration, calm motion, auto-check, smart notes, big text and dark mode.

Only on your device (or in your browser for the web version). There are no accounts, so progress does not move between devices.

Settings → Reset progress, then tap again to confirm. This cannot be undone.

No ads, no purchases, no chat, no accounts and no personal data. Links that leave the game are behind a simple grown-up multiplication check.