[Newbies] playfield limit

[Sandy Saline]

I built the Lunar Lander project from the squeakland.org website. Now I
am trying to add some more functionality on my own.

 

How do I force the rocket to stay within the playfield? I am guessing
the solution involves obtrudes or bounce but so far my attempts have
failed. 

 

Also, how do I put a background graphic inside the playfield?

 

Thanks

Sandy

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