One Line Puzzle: Connect It

One rule: drag from a dot to its matching twin, and leave no empty cell behind.

You understand it in three seconds. Getting every path to fit at once is another matter.

■ LEVELS THAT NEVER RUN OUT

Each grid is built at the moment you open it, never downloaded. The generator lays a single path across every cell and then cuts it into coloured segments, so a solution exists by construction. There is no impossible grid and no dead end, and there is no last level either.

■ DIFFICULTY THAT CLIMBS ON ITS OWN

You start on a 5x5 grid with three pairs. The grid grows to 6x6, then 7x7, and the number of colours rises to eight. The board stays readable on a phone while the puzzle keeps getting tighter.

■ NO WORDS, NO TUTORIAL

There is nothing to read. The first level teaches the rule by being trivial, and the difficulty grows from there. The game works identically in every language because it uses none.

■ FULLY OFFLINE

No account, no sign-in, no connection, no tracking. Open it on a plane, in the metro, anywhere.

■ PICK UP WHERE YOU LEFT OFF

Your progress is written to the phone as you go, and the game reopens on the first level you have not cleared. Come back three weeks later and there is nothing to search for.

■ BUILT FOR ONE HAND

Large touch targets, one continuous drag per colour, light haptic feedback when a path locks in. A restart button is always within reach, and restarting costs nothing.

■ SMALL AND FAST

Under 20 MB. Runs on phones from 2016 onward. Opens in under a second.

■ PRIVACY

No personal data collected, no sensitive permission requested. Your progress stays on your device.

■ COMPLETELY FREE

No ads, no in-app purchases, no subscription. Every level is there from the first launch.

Connect the dots. Fill the grid. Again.