The cards in Smiley Dice Game show 1-4 smileys in five different colors, while the five dice show six different smileys (with the red smiley not being on any card).
During your turn, first secure any cards in front of you that weren't stolen, then roll the dice and place at least one die on an open card, either one in front of an opponent or one from the cards in the general play area. (Fifteen of the thirty cards are used in a single game.) Then either take those cards and place them in front of you — if enough corresponding dice are on the card — and end your turn, or roll again; if you cannot place at least one die on your turn, don't take any cards and give the dice to your left neighbor.
Once all the cards have been claimed, whoever has the most smileys wins.