Aha - I was wrong; there are 3 I don't have. 7, 14, and 21. I got the hammer one, only by trial and error (just kept slamming the hammer from different heights). I don't understand the hidden ones (the ones with the question marks). I click those and nothing happens. How do I open them?

That is really cool!!!

Once a parent ... always a parent ... unless our kid(s) (all) kick(s) the bucket. And even after such a dreadful loss ... I think we'd still be a "parent". Both of mine still alive ... and vibrant. Had a half-hour chat this morning with daughter in AZ ... who called to wish her loved Dad "Happy birthday!" o j

That site may be well executed, clever with an interesting focus, BUT, it is still advertising.