from Simon Tatham's Portable Puzzle Collection

Sorry, this Javascript puzzle doesn't seem to work in your web browser. Perhaps you have Javascript disabled, or perhaps your browser doesn't provide a feature that the puzzle code requires (such as typed arrays). These puzzles have been successfully run in Firefox 19, Chrome 26, Internet Explorer 10 and Safari 6.

Rotate the grid squares so that they all join up into a single connected network with no loops.

Left-click in a square to rotate it anticlockwise. Right-click to rotate it clockwise. Middle-click, or shift-left-click if you have no middle mouse button, to lock a square once you think it is correct (so you don't accidentally rotate it again); do the same again to unlock it if you change your mind.

Squares connected to the middle square are lit up. Aim to light up every square in the grid (not just the endpoint blobs).

When this gets too easy, select a 'wrapping' variant from the Type menu to enable grid lines to run off one edge of the playing area and come back on the opposite edge!

Full instructions | Back to main puzzles page

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(thanks to chiark for hosting this page)
(last modified on Tue Jun 6 01:46:18 2017)