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Worldbuilding

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    $\begingroup$ "Any door can be opened with any key" - looks more like a token than a key (though it may look like a key). $\endgroup$
    – Alexander
    Commented Nov 7, 2018 at 20:44
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    $\begingroup$ Hello and Welcome to Worldbuilding. Please wait 24 hours before selecting an answer, even if the selected answer covers everything you need. This is a global site and we have users across the globe. This means that you might have selected an answer before someone has even seen the question. This deters further answers which could fit your criteria even better than your chosen answer. Please wait a day so that everyone has a chance at contributing and being chosen as the accepted answer. $\endgroup$
    – Shadowzee
    Commented Nov 7, 2018 at 23:21
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    $\begingroup$ tvtropes.org/pmwiki/pmwiki.php/Main/… $\endgroup$
    – Grollo
    Commented Nov 8, 2018 at 8:17
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    $\begingroup$ See sokoban level in nethack ;-) The "doors" are pits and the "keys" are boulders to fill the pits $\endgroup$
    – M.Herzkamp
    Commented Nov 8, 2018 at 14:34
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    $\begingroup$ @A.Lau Sometimes there's only one answer, it'd be pointless to wait 24 hours to see if someone else posts the exact same answer, it may also be a global setting across the entire StackExchange sites, were single answer questions are more common. $\endgroup$
    – Inferry
    Commented Nov 9, 2018 at 4:32