<h1>Lights Out</h1>
Lights Out type. One deck. No redeals.

<h3>Object</h3>
Flip all cards face-down.

<h3>Rules</h3>
<p>
A number of cards are dealt in a square grid, with some face-up and
others face-down.  Any single card can be flipped - if a card
is flipped, all of its adjacent cards horizontally or vertically
are flipped as well.
<p>
The game is won if every card is flipped face-down at the same
time.