1) Can we make notes in the wrong colour as long as the final cell is coloured correctly? For example in the Tapa could we write Ps around a purple cell to indicate these cells are coloured either red or blue before knowing which colour it will end up being?
2) Can the person holding the non-participating colour give hints or notes on solving that puzzle as long as they don’t write anything down? If not, how exactly will this be enforced during the solve to prevent anyone from doing this?
3) Can there be printouts at the championship in the size of the competition puzzles beforehand so that people with colour blindness can judge which colour will work best for them?
Can there be a clue cell that has all three colours around it?
Same question: Can there be a clue cell that is illuminated by all three colours?