On the menu screen, type the following:

      "kochamzabijanie" ____________________________ Immortality
      "jezusmoimpanem" ____________________________ Weak enemies
      "sramnapc" ______________________________________ 12 lives
      "puszczabukowa" _____________________________ Second level
      "starygrzyb" _________________________________ Third level
      "ciemnajaskinia" ____________________________ Fourth level
      "zamekzabytek" _______________________________ Fifth level
      "uczciwy" __________________________ Clear all cheat codes
      "kalasznikov" ________________________________ Machine gun
      "jezuszabijaka" _____ Kill enemy with crossbow in one shot
      "szczecinrulez" ________________________________ 7 credits
      "drewnopc" ________________________________ Better enemies