Lights!

Lights! is a shareware, single player, mouse controlled logic game similar to Lights Out

The player is presented with a 4x4 grid with most cells coloured green and a few coloured red. There is a hidden, randomly generated, relationship between the cells such that clicking on any cell will change the state of one or more other cells.
The game has three difficulty levels.
The registered game has the following additional features; Buttons can have three states not just two; a customisable difficulty setting; a customisable grid size; and a high score table.