Scratch

when gf clicked
forever
if <touching [wall v]?>
set [direction choosing v] to <pick random [1] to [4]>
if <<direction choosing>=[1]>
point in direction [0]
end
if <<direction choosing>=[2]>
point in direction [90]
end
if <<direction choosing>=[3]>
point in direction [180]
end
if <<direction choosing>=[4]>
point in direction [-90]
end
end

It's not the most efficient way, but it will work. It will go in direction 90, or -90, or 0, or 180. If there's a wall there it will just do it again.

MoreGamesNow wrote:

I once toyed around with Pacman and Scratch.  I basically stored all of the intersection's x and y positions and what directions their respective walls were in, and then chose out of those walls.  More mathematical than MaxFlyboy but his way works just as well (probably actually a lighter work-load).

You might be interested to know that the "real" Pacman isn't random.  Each ghost follows very specific rules.

Except for Clide. Clide's is perfectly random. I wonder why... He's always been the dullest knife in that drawer, hasn't he?