The Witcher: Old World
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How do you tell which combo extensions match a card's colour if you are colour-blind?
Look at the small dent in the left border of each coloured card. Cards of the same colour have it in the same position as the matching combo extension, so a dent that lines up with an extension means the cards connect. Most grey cards have no dent and match no extension, but one grey card has every dent and matches any extension. The symbol at the bottom left also differs by colour.