Dig Dug is another example of a fantastic port of an arcade classic on the X1. I haven't played it on the PC-8801, so I can't speak to that but compared to the FM-7 port, this is a much more enjoyable version. Instead of the FM-7 requirement to press an unused key to stop movement, this game not only doesn't require that, but supports joystick play. The enemies are a more authentic color, although the dirt colors and aspect ratio are more accurately represented on the FM-7.

This one came in a pretty clean original box with instruction card.