This is very close to the final version. Much like the
5-15-84 proto, the game looks the same so the changes are most
likely behind the scenes optimizations and bug fixes. One
noticeable difference with this version is that the colors are one
shade brighter than it is in the final. This difference is
very hard to notice even with the two games running side by
side. It's unknown why this was changed, but it may have had
something to do with shortening the 'fade in' effect between
levels.