attach CPT data to a taxonomy

I would create a separate Reviews CPT. In the Reviews write screen, I would add a metabox with a select input contain each Game CPT as an option. Using the metabox, you can associate the Game ID as postmeta with the Review. Finally, in your template page that displays the review, you can easily retrieve the Game ID, which will allow you to display all of the relevant Game information on the Review page.

For an even easier solution than the metabox, you can simply add a custom field like “game_id” and manually add the game id. It’s simpler than creating a metabox, but it’s not as pretty 🙂