Browsing the eligibility requires for the Horror Writers of America today, I came across these possible qualifications:
ix. The writing of three role-playing games, gaming modules, scenarios, sourcebooks, or other role-playing gaming projects related to horror or dark literature of at least 10,000 words each, and each paying at least five cents (5¢) per word.
x. The writing of one role-playing game, gaming module, scenario, sourcebook, or other role-playing gaming project related to horror or dark literature of at least 40,000 words, paying at least five cents (5¢) per word.
xi. Payment of $2,000 for the scripting of a computer game related to horror or dark literature, or a single work of interactive fiction intended for electronic media, regardless of length or memory usage.
xii. The writing of a computer game or a single work of interactive fiction related to horror or dark literature for electronic media without payment in advance, but with a paid circulation exceeding 1,000 copies, of which all or part of that payment has been received by the writer -- i.e., "shareware" with over 1,000 registered copies.