Hello there!
I believe original suggestions have not been closed 
- Game Suggestion : Capture the Flag
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https://forum.playhive.com/t/my-idea-for-capture-the-flag/4085?u=itswooziee
Even if you find closed suggestions, they are most probably duplicate and we know about it.
Just for future reference Archived suggestions are duplicate suggestions.
You can always suggest further improvements in someone’s suggestion by commenting on that thread.