Net is one of Simon Tatham's portable puzzles. The grid is full of tiles with pipe pieces on them, all turned the wrong way. Turn them so that every piece joins into a single connected network with no loops; the tiles connected to the centre light up as you go.
Every puzzle is generated fresh, there are several sizes, and you can lock tiles you are sure of so you do not turn them by accident. When it gets easy, the wrapping variant lets pipes run off one edge and back in on the other.
Controls
Left-click a tile to turn it anticlockwise, right-click to turn it clockwise. Shift-click (or middle-click) locks a tile. Best with a…
Genre
Puzzle, Logic, Desktop
Price
Free — no account, no download, nothing to install
Tips for Net
Start at the edges: a pipe end can never point off the board in the normal game.
Lock every tile you are sure of; it makes the rest much easier to see.
A tile with a straight pipe has only two different positions, so it is quick to settle.