What can be more difficult to screw in a light bulb normal ?!
And if you need to build a special robotic mechanism for this ?!
RustySandbox - This is mobile sandbox in which you have to constantly be inventiveness and create mechanisms for non-standard solutions of simple problems. You can build absolutely any devices from a simple loader and excavator to complex robots. With the help of your inventions you have to grab and move loads, dig the rubble, to play football, and even catch a real flying saucer!