Great tut, this will be helpful for some people.
<>Branch if This Event Down Facing
<>Move Event: This Event, Turn 90" Left, Turn 90" Left, Turn 90" Left
<>Change Money: 100 Add
<>
: Else Handler
<>Message: It's empty.
<>
: End
<>
@>Conditional Branch: Self Switch A == Off
@>Set Move Route: This Event
: : $>Change Speed: 1
: : $>Turn 90 Right
: : $>Turn 90 Right
: : $>Turn 90 Right
@>Control Self Switch: A =On
@> Change Gold: + 100
@>
: Else
@>Text: It's Empty.
@>
: Branch End
@>
Wouldn't the thing change if you moved out/back into a screen?
Simple is good. Don't teach anymore than this and let them learn the other ways of doing things and such. :V