Alistair is correct. AFAIK, the most common DOS releases of KQ6 were in larger boxes with blue, red and black slipcovers, and as mentioned contained the tall version of the guidebook printed on higher quality paper. The common CD-ROM release was in a somewhat thinner white box and contained the CD-sized guidebook. There is also a one-piece larger purple box slash CD release out there that you want to avoid like the plague – it has no guidebook at all.
