Pitch Black

Pitch Black is a puzzle game consisting of a grid of lights that are either on or off.
Pressing any light will toggle it and its adjacent lights.
The goal of the game is to switch all the lights off.

The game will end when all the lights are off, or, if a player gets stuck, when the player manually ends the game.
In the event the game is ended manually, payout will be determined by the number of lights left on.