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The lights turn off and on next to each other. Meaning if you have three lights across and the one in middle is the only one lit, then if you click it, the middle light will go out and the outside ones come on. So basically you'll want to plan your moves to make it where it is possible to turn off the lights with out more coming on.
The hardest one is the final one with the 3X3 grid, the other ones are easy.