Circuit Commander is a action/puzzle game. (freeware)
It is completely written in XNA 3.1 and C#. Your goal is to collect all objectives (diamonds) in order to open the teleport to the next level.
Half the game is to create your own levels and compete against your friends. Its easy with the build in editor.
Circuit Commander is my kind of "show off" - it's full of small effects which maybe shouldn'd be there, but just to test it out and see if i could make it work, i put it there anyway :-) - Try it, and please try the editor as well, its easy to use, and you can create a lot of fun connecting switches to lazers, traps, doors, flames, etc.
See the video, to get a understanding about what Circuit Commander is. And should you create some cool levels, don't hasitate sending them to me :-) - Use the contact page to get in touch.