From publisher: There are 104 cards numbered from 1 to 104. Every card has at least 1 small ox-head on it, which will score against you. The deck is shuffled and players are dealt 10 cards each. 4 more are dealt up on the table to form the start of 4 rows.
When each player has chosen a card from their hand, these are revealed and put on the ends of the rows according to simple rules. As the rows get longer, a row with 5 cards in it is full. If your card is to be the 6th, you pick up the 5 cards in the row, and your 6th card goes to the front to restart the row. The cards you pick up do not go into your hand, but sit in front of you to score against you at the end of the round. Play rounds until someone hits -66 and the least lowest score wins.