Lights Off!,
.NET Compact Framework 3.5 required.
Gameplay:
-If you click any of the LEDs, the LEDs state (On/Off) will be changed.
-The 4 LEDs above, under, right and left to the clicked LED will change their state too
-The goal is to have all LEDs turned off.
Update:
Now with Restart Button.
Remake:
Shrinked the whole Program about 20KB.
Increased stability.
Version 2:
Added Multiple Levels.

PC version (Without multiple Levels) is available at: http://jonaskoeritz.jo.funpic.de/cab/LightsOff%20PC.zip