Golf Solitaire Pro does not force players to play a full 18 rounds.  A game concludes when a deal cannot be fully solved.  This can happen as deals are entirely random. We do however offer a Wild Card per round to help, if a deal turns out to be disadvantageous (there is a charge for additional Wild Cards).  As a side note, there is no cap on the number of rounds, so it is possible to go to 18 rounds and beyond.