Tendo

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
the line above INISectionHeadings=die doubled commas.