Slideshow
1. Start the game. 2. Push RETURN. The "Puzzle in London" title is displayed. 3. Push CTRL+STOP. The screen becomes invisibly dark. 4. Push Shift+F1 to restore color. Unnecessary if you can type 5. and 6. blindly. 5. Execute LOAD "G0A" 6. Execute SCREEN8:RUN to start the slideshow.