Causality is a re-imagination of the classic puzzle game / toy of the 90s, "Lights-Out". The objective of every stage is simple, toggle all tiles into the same color. The basic gameplay is just as the classic game, when you toggle the color of one tile, adjacent tiles will have their colors toggled as well. One can solve each stage by trial and error, or aim for a minimal moves solution, all at one's own leisurely pace. There is no timer to rush, no expendable energy to ration, no leaderboards to climb, just play at will, like one would with an actual physical brain teaser toy.