One version is common, at least one other version is rare
Notes
Game design by Ed Ringler; game logic design support by Ed Ringler & Mike Ferrando. Main coding by Chris Oke; additional coding by John Wilson, Simon Ffinch & Clayton Wishoff. Graphics by Ed Ringler Snr., Malcolm Kirton, Chris Oke & Ed Ringler.
Conversion Notes
Based on 1987 DesignStar/Mindscape 8-bit (C64/128, PC) release. PC releases: CGA, EGA