Windows :

• Open the run dialog (Windows key + R) and type : %appdata%
• Go in the Pingus -> savegames folder.
• Delete both files (savegames.scm and variables.scm).

Linux :

• Go to your user directory ($HOME), in the .pingus -> savegames folder.
• Delete both files (savegames.scm and variables.scm). OR
• You can use this command : rm $HOME/.pingus/savegames/*

## Mac OS:

• I don't know the precise directory, but probably in your home folder.