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Very fair points. I can imagine that it might get frustrating, not finding that one final piece. Maybe the hint system could've started to make evidence stand out more/glow if you used a "ponder" action or so, and then slowly dissipate. So you could've seen glows looking out the windows and have clues where to go, yet maybe nothing too precise. But then again, you already said the game's focus was  elsewhere. Looking forward to the Murder Express remaster, good luck with 2000:1's Steam launch, and your future releases!