Depending on the value of the card you played, you must place your set in the following ways:
Values 10 & 9: Vertically.
Values 8 & 7: Horizontally.
Values 6 & 5: Either horizontally or vertically.
Values 4 & 3: Either horizontally or vertically.
Additionally, you may discard either the 1st or 4th balloon from your set (place it in the discard pile).
Values 2 & 1: Either horizontally or vertically.
Additionally, you may discard either the 2nd or 3rd balloon from your set (place it in the discard pile) If you discarded a balloon, push the remaining balloons together, to form line of 3 balloons.