TrippyHippy
Emperor Mongoose
Well, the claim was that Twilight: 2000 was GDW’s biggest selling game. It clearly wasn’t over time and the chart doesn’t include the data following 1986 - Mega Traveller was released in 1987 as a replacement new edition of Traveller and, I’d imagine at least would have overtaken Twilight: 2000 sales again. Classic Traveller probably wasn’t producing much new stuff in 1985 and 1986 to sell.That's the print run, but graph it by year:
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Traveller was no longer the best selling rulesset. Twilight: 2000 overtook Traveller in 1985-6. Remember, this is all materials, including supplements etc.
Either way, Twilight 2000 in no way replicated the overall success of Traveller, even when it was first released. GDW as a whole had declining sales from the late 80s onwards.