Logical puzzle about switches and lamps. The game consists of a system of switches and lamps (matrix). When a switch is activated, one or usually several lamps change their state (light or dark). However, there is exactly a combination of switch on and off states, in which all lamps light up. The aim of the game is to find out this combination. The number of switches or lamps can be freely selected between 4 and 25, which logically also entails different levels of difficulty. As a little help, you can lock certain switches whose function you already know.
