There are zillion things you will have to tackle before you are done (been there done that!).
Start simple;
Figure out how to use an event structure to detect a Mouse down/up. You will need that to detect when a user clicks on a puzzle piece and drop sit.
Figure out how to detect a Mouse Move - This will be used to move the piece along with the mouse.
Figure out how to get the coordinates of a Boolean - You will need this to figure out if the user clicked on a Boolean.
Figure out how to set the position of a Boolean using property nodes.
Figure a state diagram describing the process of selecting moving and dropping - You will need this to code the object move using a mouse.
to get you started...
See this thread about dynamic Event registration. I posted an example of dropping a Boolean image in a picture indicator in that thread.
See this thread for links to thread about using a picture control.
Please note grabbing an part of an image in a picture control and moving it is an advanced task. Save that for latter.
Also note that to get a puzzle piece with convex borders will require to figure out how to create a mask for the image. It can be done but is not trivial.
Have fun!
When you are done post it so others can learn from your example.
Ben
