Level  Code
-------------------------------
   5    ABPCOOBABH ABOLKEFEFL
  10    OLMNDOMIHA PCGKMGKGKH
  15    OLABEPEGKA FEKGDABABH
  20    IHKGDINMNF AHABMGKEFL
  25    OLHIMEGEFL HAHIPBAHIH
  26    DJEFPLPLOC NJNMBEFLOH

Codes by Felipe Gerhard - felipe.gerhard@gmx.net