Check out this interesting game. As the name implies, it involves clicking, dragging, and typing to figure out the answers. Should especially be a good time waster for those "working." http://www.notdoppler.com/clickdragtype2.php
I've gotten them all. Pretty good puzzles. Edit: To get the nail gun to work you have to move it. Do that the same way you move the wood. it has to be touching a piece of wood. and you have to shoot them in the right spot.