0. (the original version) only balls
1/a. path line + "balls" + Arrow on the end (over unit sprites)

1/b. path line + "balls" + Arrow on the end (but under all unit sprites)


1/c: same as "a" but the starting line does not cover onto the moving unit as the line starts on the edge of the tile

2. only balls and Arrow in the end

3. All objects are arrows (in place of earlier balls).

