Dunko says:
... a shared board showing score ...
Cool. They will have seen it and been both impressed and envious. Having, now, met you they will still be envious but it is up to you how impressed they are. :)
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What does the board say?
Does it list the name 'Blank' or is there a ' ' there which no one else can work out how to replicate (
they all have to enter at least three letters), or did you use some other name?
Dunko says:
... could prove his virtual identity on the fly ...
Depending on how much you want to play with this fame, they could either just believe you ("how ever did you get past the ...?" or something); or dismiss your claim and make you need to work to back it up; or it could be trivial to prove. Were is me, I would be inclined to avoid proof and have most believe and some doubt/deny.
Dunko says:
... not worrying about guarding the entry ...
Guard against what, though?
If their parents or friends come along they are not going to side with you strangers.
If something from the other side comes along, what are they going to do? Die? Their best chance of survival (baring 'going home') is for you to keep them safe.
Dunko says:
... if there is nothing to mine here ...
You can work on your relationship with them. A little chatting will quickly reveal the above facts to Blank (no roll needed), and some ongoing work can even turn them into trustworthy companions... and you may even learn their 'strengths', enough to make the useful.