qr-code image
crop smaller qr-code image from first
go to website, scan barcode
enter result, scan next barcode, repeat
receive flag: brixelCTF{m4st3r_0f_sc4n5}

Original writeup (https://md.darknebu.la/4cDzvoArTDCD-hpjSmVTwQ?view#Scan-Me).