[plt-scheme] HTDP 22.3.1 Scoping.

Is the intent for the student to go as far as to replicate the success 
screen of 9.5.5 that offers the player a chance to play a new game.

This would involve redrawing the screen with a third row, knowing how to 
implement a "close" button and "ideally" disabling (or having a do nothing 
callback for) the check guess button (since at that point all the player can 
do is start a new game or terminate).

I guess I've answered my own question since the latter two are beyond the 
facilities made available to the student at that point in the book. I have 
presumed it is adequate to get to the point where the game returns 'Perfect 
for a correct guess.