I hope I understand your questions correctly:
1) to switch off all the LEDs on the Score Board, you have to press the BingoButton, this will restart the game.
2) By adding some extra code it is possible to store all the scores of one game in a file and print it via the USB interface with the Arduino IDE serial monitor. Taking a photo with your camera of the score board (before pressing the BingoButton) is of course also a good solution.

Thank you for your kind words.
Best Regards
Pedro

Dear mad_b
Your idea looks feasible, it might help to eliminate measurement inaccuracies with respect to the reference values as a result of voltage changes of the power supply. The solution requires a second measurement channel with an identical resistor network as the first sensor. Also some mathematics will be needed to calculate the new reference values (once in a while) using the formula as given in figure WaterLevelValues vs Level. In addition you could consider to also sample the "dry" value for better results and put that into the equation.
All this will contribute to more consistent level indications over time.

Thank you for bringing this idea on the table.
Best Regards
Pedro

Dear Claudio
Thank you very much for your reaction. I have chosen the fondue forks because I had them available, but they also be bought a really affordable prices in cheap stores like e.g. Action ( I don't know if they are present in your country); Someone suggested to use stainless steel welding rods. Should work as well. The length and distance certainly has an influence, if you use the same type of connector as I did you get the same distance between the pens. In any case you have to calibrate to define the dry and wet figures in the software.
Hope you succeed, if so let me know.
Best Regards