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How to play PFB

Try to guess PFB's number;
use feedback to refine guesses.
example: settings and answer
Allow Zerochecked
zero is possible digit
Digits:3
guess length
answer029
generated by PFB
valid guess characters
digit1-9 and maybe 0
but no duplicate digits
qwertyuiopsubstitutes 1,2,...0
but no other letters/chars
? or /reveal answer digit
<enter>same as Guess button
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