Dumb SEO Questions

(Entry was posted by Davide Renzi on this post in the Dumb SEO Questions community on Facebook, 08/09/2018).

Again, separate domain or sub-domain?

Hi all,
I want you opinion about a webgaming portal.
Within the portal each game has its own pages with rules, rankings and access to the game...
To get the best SEO what`s best:
1 - have third levels for each game (game1.example.com);
2 - have separate domains for each game (multiple for the same game?!) that maintain content and a link to the parent site for access to the game (game1.com, anothergame1.com, ...)
3 - have the solution 1 and 2 taking care to publish different contents or by instructing the search engines on which is the canonical url

How do you think it`s best to do?
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    View original question in the Dumb SEO Questions community on Facebook, 08/09/2018).