This was based on traditional wire / buzzer games, but the loop on the end of the 'wand' had a notch in it so that the rail could have support points. This was to help it survive touring various festivals for Nando's.

Different diameter wand loops set the difficulty level. Touching the rail triggered a short sequence to flash the LED strips and buzzer.

If I owned the Nando's chain I would change the restaurants to include other logic gates, and make two entrances for each, so for example at Xnoro's you would only get served if you went in with a friend. Or if you didn't go in at all. I guess that's why I'm not in charge of Nando's.