This will help you in a maze game.(As it is pesky when sprites jump the walls.)

Step one:

when [ left arrow] key pressed
change x by (5)

when [ right arrow] key pressed
change x by (-5)

when [ up arrow] key pressed
change y by (5)

when [ down arrow] key pressed
change y by (-5)

Then, lets say your walls are pinkish. Add these scripts to the according

if <touching color [#ff0088] ?> then
change x by (-5) for first or 5 for second
if <touching color [#ff0088] ?> then
change y by (-5) for first or 5 for second

    
end

    
end

when [Left Arrow v] key pressed
change x by (-5)
if <touching color [#ff0088] ?> then
    
change x by (5)
end

when [Right Arrow v] key pressed
change x by (5)
if <touching color [#ff0088] ?> then
    
change x by (-5)
end

when [Up Arrow v] key pressed
change y by (5)
if <touching color [#ff0088] ?> then
    
change y by (-5)
end

when [Down Arrow v] key pressed
change y by (-5)
if <touching color [#ff0088] ?> then
    
change y by (5)
end

This Script Should Work for what you're trying to do!