Lights Out

THE PLAYBOOK · 850305

How to play Lights Out

For Lights Out, 850305 puts the actual rules alongside the playable board or activity. Turn every light off. Every supplied starting state is made by valid flips from an all-off board and is therefore solvable. The suggested practice focus is careful restarts.

Careful restarts

Start a fresh round when you want another attempt. Restarting may discard current progress; read the controls rather than assuming an account backup exists.

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