$675f ld a, ($720d)
$6762 cp $04 ;is this level 4?
$6764 jr z, $66fb ;yes it is so exit to main game loop as no further
;progress is possible.
;when you touch a graphic $31 or $32 (these
;two graphics represent the exit doors when
;you collect a stone) or a graphic $29 or $2A
;(these two graphics represent part of the
;mine shaft) then a flag at $831d is set to 1.
;see $8353 onwards.
$6766 ld a, ($831d)
$6769 cp $00 ;have we touched an exit?
$676b jr z, $66fb ;no we haven't so exit to main game loop
$676d jp $6ff8 ;jump to mine carts/load next level etc.
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