Tap a line and it slides away the way its head is pointing. If
another line is in its road it bumps and comes back. Clear every
line off the board.
You cannot lose
Taking a line off never traps another, so every board can always be
finished, however it is played. A bump costs nothing but a tap, and
the fewer bumps, the better the score.
Stuck?
Show me lights up a line that can go. Undo puts the
last one back. And Finish it for me, in Menu, clears the rest.
Big boards
Spread two fingers on the board, or turn the mouse wheel, to zoom
in; drag to move round it. The + and − in the
corner do the same, and See it all fits the whole board back
on the screen.
On a keyboard
The arrow keys walk from cell to cell and Enter sends the line
under them away. + and − zoom, and Escape
opens Menu.