This version was also ported to the Macintosh.

Later versions of the game were ported to Windows in order to make it more compatible with modern computers.

This version was ported to a variety of personal computers popular in the early 1980s.

An enhanced version of it was later ported to the Sharp X68000.

This version was later ported to Windows.

This version was later ported to the Sega Saturn and released worldwide.

More recent versions have been ported to even more systems.

This version was subsequently ported back to the Spectrum.

This version was later ported to the Sega Saturn, instead, but exclusively in Japan.

Some versions of Ubuntu up to the release 10.10 have been ported to the PS3 platform.