Some interesting scaling here - particularly notable that the first Zork continued to dominate, even when the two sequels were released. Would this ever happen in today's sequel-happy market? Uhm, no, basically not - though I guess you could argue that the closest to it was The Sims and The Sims 2 continuing to get bought in large-ish amounts as people also snack on expansion packs.

This pie chart further exemplifies the diminishing returns of the later entries in the Zork series - but honestly, even the later ones sold well compared to other Infocom titles.

Yet as can be seen from the following graph, the first three Zork games are in the overall top five Infocom best-sellers of all time - or at least in non-compilations for the key 'golden age' period of the developer:

We've already done a little analysis into this in the earlier post, but things to note - Deadline, which is really not that well known nowadays compared to a lot of other Infocom games, is the highest non-Zork or Hitchhiker's seller, partly because it was released nice and early.

Also, I'm a little disappointed in Trinity's sales, but it's a pretty adult, complex game, so that's not completely surprising. Anyhow, these aren't all-time sales, one suspects, especially given the compilations with lots of Infocom games on them released latterly, but it's a really interesting starting point. Thanks again to Matt for the awesome work on this.