Lights Out

THE PLAYBOOK · SZHLJS

How to play Lights Out

The SZHLJS guide to Lights Out starts with a short learning break. Your task is to turn every light off. Every supplied starting state is made by valid flips from an all-off board and is therefore solvable. The controls and example below describe this exact implementation.

A short learning break

Choose one objective for this visit: understand the controls, complete a round, or recognise a common mistake. Progress does not need to be rushed.

Your goal

Turn every light off. Every supplied starting state is made by valid flips from an all-off board and is therefore solvable.

Step by step

1. Select a light or an unlit tile.
2. The selected tile and its orthogonal neighbours switch state.
3. Plan flips so that previously cleared rows stay cleared.
4. Use Undo to try another approach.

Controls

Use the on-screen controls with a mouse or touch.

A useful example

Tapping the centre changes five cells. Tapping a corner changes three. Diagonal neighbours are not affected.

Watch out for this

An unlit tile can still be tapped; it may be necessary to solve the board.

Common questions