Link to the contest (you need an Open Cup login to participate).
The round is based on local competitions organized in 2018 and 2019 in Wrocław. Tasks were invented, prepared and translated by gawry, bardek, Arti1990, Rafiki53, Skedar, koratel, Kreyyy, Łukasz Zatorski, Arblash, yarek, MicGor, Maciektoja, w0nsh, kobor, Fly_37 and me.
UPD: There was a wrong time written at the beginning! I got confused because of the time change in Poland and I am deeply sorry about that.