The grid starts with some lights on and some off. Toggling a cell flips that cell and its four orthogonal neighbors (up, down, left, right). The goal is to turn every light off.

Controls

Key	Action
Arrow keys / WASD / hjkl	Move cursor
Mouse left-click	Toggle light
`Enter` / `Space`	Toggle light
`Ctrl+R`	Reset puzzle
`Ctrl+H`	Toggle full help
`Escape`	Return to main menu

Modes

Mode	Grid	Description
Easy	3x3	Small grid
Medium	5x5	Classic size
Hard	7x7	Large grid
Extreme	9x9	Maximum size

Quick Start

puzzletea new lights-out easy
puzzletea new lights-out medium
puzzletea new lights-out extreme