The phrase "z najlepszymi polskimi" should be left out. It sounds as if you want them to "join Poland's FINEST to help fight Poland's FINEST." Doesn't make much sense.
Poland's FINEST
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If you need help, please contact our Help and Support team.
Do wszystkich najlepszych polskich graczy tutaj: Należy dołączyć wszystkie Poland's FINEST i pomóc w walce z najlepszymi polskimi!