when green flag clicked
if <touching color [#FFFFFF] ?> then
change y by (-1)
end

when green flag clicked
forever
if <touching color [#FFFFFF] ?> then

if <([ X position] of [Heart v]) = [X Top of the box ]> then
change x by (-1)
end
if <([ X position] of [Heart v]) = [ X Left side of the box]> then
change x by (-1)
end
if <([ Y position] of [Heart v]) = [Y Bottom of the box ]> then
change y by (1)
end
if <([ X position] of [Heart v]) = [ X Right side of the box]> then
change x by (-1)
end
end