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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
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(last modified on Mon Mar 9 01:42:11 2026)