You receive access to all levels by a small manipulation of the 
 file TENDO.INI in the Windows Verzeichniss. 
 Modify with a wordprocessor (about Windows note PAD) 
 in the paragraph [ to BOARDS ] the line 
 
 PMB =... (crude line salad) 
  in 
 
 PMB=FBPNFFONIJLHJOLICEFPAHNDML
 
 In order to arrive also at the two bonus levels, you delete in