Place tiles which have a number of pips that matches one of the exposed ends of the chain. If you have no such tiles you have to draw from the boneyard one tile at a time until new one may be played.
After placement player will get points if the sum of pips at the exposed ends of the chain is a multiple of five (5,10,15,20,etc).
At the end of the round player also scores points for all the pips remaining in the opponents hand rounded to the nearest multiple of five.
Winner is the first player who reach the score of 150 points.