We seem to have a fondness for family board games played in relative darkness with small sources of light part the the strategic gameplay. Khet seems destined to be another favourite. This was our Christmas Eve game this year.
Basic Khet is played with four types of gamepieces. Almost every piece shares the same two basic moves. Where they differ is in their reflective capacity. Djeds reflect the light at 90-degree angles from both sides, pyramids do the same from only one side. Obelisks block light. The pharoah is the "king" of Khet, naturally, and the aim of the game is to protect him from being hit with the laser beam that originates in the corner of the board and bounces off the various pyramids and djeds. The expansion set adds two "Eye of Horus" beamsplitters. These split the laser beam, transmitting one part of it straight through and relecting another portion just like a djed.
This game taps into visual-spatial, logic and strategic skills in a huge way. My kids all seem to have a lot of these things, so, combined with the dark and the lasers, the game seems likely to get plenty of play, both according to the rules and outside-the-box-wise.