I don't know if anyone already mentioned this (probably someone has already done) but I was thinking about another label under "Other Details".
I was thinking about something like:
- Played
- Completed
- 100% / Platinum
This would make people track their backlog and show other their accomplishments
Other possibilities were also possible like a check box to mention if the game is limited to a subscription like PS+ and XBox Gold. Even though this could easily be mentioned in the "Notes" but most people don't do that