Popups work but are not really sexy. And they add a step in normal case (with a not really good feeling… “Of course I want you to restart, I clicked this button!”). And they cause bugs when you open a second modal dialog at the same time. I think a single window pattern with an “undo” button[1] like in Sudoku is really more pleasant, at least for game, if not for all the apps.

[1] cross-linking of bugs: https://bugzilla.gnome.org/show_bug.cgi?id=664976#c9

Yes, it's always best to avoid the message dialog if possible. An undo button does not work here since you've started a new game and undo should be insensitive at the start of a new game (otherwise it would be confusing that you can use undo to restore the previous game, especially if the computer player moves first), but if we had a new game screen then a back button like in Sudoku would be best.

So Michael thats means ,first we should work on new game screen that is filed as bug 664976. Later on,we can fix this issue. Is that fair enough?

Well if we have a new game screen, there wouldn't be any need to fix this issue, since the new game screen would have a back button to allow you to return to the game in progress.

I close this bug as the new-game screen does its work.