I designed this (I think) nice congratulation widget for PuMoKu. As you may guess, it is meant to pop up when a game is solved only. It will not obey though, for reasons I do not understand, as copied the code from the #kirigami wizzards :\
The idea is that it does not cover the board, so that you can have a look before moving on. Hopefully, I will get along with #qtquick, #qml at kirigami at some point ...