Darts gamble.

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On the board, a slice with green sections, like 20 or 16 (and the black outer bullseye 25 points) counts as plus points, a slice with red sections counts as minus points. The total is divided by 10, then rounded UP in every case (i.e. - 9 becomes  -0.9 = -1, but + 11 becomes + 1.1 = +2) to be taken away from or added to your score. Each person in your team gets 3 practice darts and 3 darts to count for score. With the scoring darts, any which miss the board must be taken again. If they bounce off the wire or stick in the outer black section, they count as zero. The outer narrow band is double score and the inner narrow band is triple score.