Blindes Huhn

In this tiny auction game it is your goal to increase your farm of hens to claim majorities in 5 colors. In addition your three most valuable colors boost your final score. But you have to pay your bids with the hens you already have collected. Choose wisely which cards you pay to your opponents, because they might get the majority in one or another color.
Since only the auctioneer knows all three cards of the offered set, it is easy for a blind hen to join your farm bringing some negative points. Can you join the blind hen with a golden corn to turn the negative points into a positive score?