Commander Keen in Invasion of the Vorticons is a featured article; it (or a previous version of it) has been identified as one of the best articles produced by the Wikipedia community. Even so, if you can update or improve it, please do so.
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Well, that article is pretty direct in saying it was released 5 months after they decided to make Keen, yeah. But It's also just flat-out wrong- like I said in my revert, the idea to make Keen came only after Carmack worked out how to do adaptive tile refresh on PCs, and he did that in "September 1990". That sequence of events is well documented. We don't have a more specific data that I know of for the start of development, but we do know that Keen 1 came out on December 14, and unless I'm going crazy mid-September to mid-December is exactly 3 months, not 5. Either NG was misquoting Romero or Romero misspoke. --PresN 14:53, 28 September 2018 (UTC)[reply]