Draw one line through every square, reaching the numbers in order. That's the only rule, and every board is a fresh little logic problem to untangle.

Every board has exactly one solution. Each one is made on your phone and checked by a solver before you see it, so there's always a clean answer to find and never a guess.

HOW TO PLAY
• Start on 1 and drag through the grid.
• Reach 2, then 3, and so on up to the highest number.
• Fill every square. Thick bars are walls the line can't cross.
• Slide back along your line to rub out a mistake, tap any square of it to go back there, or tap Undo.

PLAY AS MUCH AS YOU LIKE
There's no daily limit and nothing to unlock. Solve a board and the next one is ready.

DIFFICULTY THAT FOLLOWS YOU
There's no setting to choose. Boards get harder when you solve them comfortably and ease off when they're giving you trouble. Easy boards are 6 by 6, Medium boards 7 by 7 and Hard boards 8 by 8.

A HINT WHEN YOU'RE STUCK
Hint shows the route to your next number. If your line has gone wrong, Hint erases it back to your first mistake, then shows the way on. Hints are unlimited, with a short wait between them, and taking one never counts against you.

CHALLENGE A FRIEND
Finish a board and share it with your time. Your friend pastes the code into Settings, plays the same board and sees if they can beat you.

A REMINDER, IF YOU WANT ONE
After your first solved board you can switch on one gentle reminder in the early evening. It never arrives on a day you've already played.

MADE FOR YOUR PHONE
• Plays offline, with no account and no sign-in.
• Light and dark appearance, following your phone or your choice.
• A small tap for each square you fill, which you can switch off.
• Your progress and streak stay on your phone.

Zip Unlimited collects no personal information.