This version appears to be mostly complete, but still has a few
bugs in it. One of the biggest is that you don't have to get
the treasure to make the mermaid appear. Simply go down one
screen and then back up and the mermaid will be waiting to take
you to the next level. You also can't go back down a screen
once you go up. Another strange quirk is when you change
screens all the creatures die and you get the 500 points for
killing one them (although the faster versions don't
appear). It is thought that a later and more complete
version exists.