Negative information in Hanabi

[beri]

Same here, neg info is really helpful.

[JoshTriplett]

I'd like to see this as well, as an option players can choose to use. It doesn't tell players anything they don't already know, but it eliminates mechanical memorization.

(I'm really tempted to start taking written notes in my next real-life Hanabi game, because clue-tracking is just too useful.)