The game was sold in cassette tape and floppy disk versions.

The capacity difference between the two formats necessitated alterations to the floppy disk version.

It's a game of two halves: the disk version is much better than the tape, with the addition of management and league option.

If purchased separately, the conventional disk versions of all the programs would cost nearly $3,000.

Additionally the disk version has become available a little bit after.

All the games listed are disk versions unless noted else.

There are also disk versions, at $40 and $69, respectively.

The disk version only has four planets (out of seven) and has less animation.

The first three include voices instead of the "goblinish" talk that featured on the floppy disk versions.

Its publisher has since recognized that the mass market is the only market for the disk version and priced it as such.