HG authors can enter, assuming they meet all other eligibility guidelines. CoG authors cannot.
Read the second paragraph of “Eligibility.” Okay, who do I bill?
ELIGIBILITY. Open to individuals who are legal residents of the fifty (50) United States or the District of Columbia, the United Kingdom and Canada (excluding the Province of Quebec) and are the older of 18 years of age or the legal age of majority in their jurisdiction of residence at the time of entry. The Contest and these Official Rules are void in Quebec and where prohibited by law, and are subject to applicable laws. Entrants may not be members of any guild, union or other organization that may prohibit them from participating in this Contest and that would restrict, require due payment or otherwise have the right to oppose such entrant’s participation in this Contest.
Not open to employees or independent contractors, or immediate family members (spouses, domestic partners, parents, grandparents, siblings, children, and grandchildren) or those living in the same household of employees or independent contractors of Sponsor, authors who have previously published games with Sponsor or are under contract with Sponsor, or any entity involved in any aspect of the Contest (including funding, judging or administration), and each of their respective parents, subsidiaries, affiliates, advisors, or advertising/promotion agencies. Current contracts with or prior publications with Hosted Games LLC do not affect the eligibility of authors to participate in this Contest.