how to play Doomlings - Castle Glass

About Doomlings: Castle Glass Bolster Expansion, from BoardGameGeek:

This new Doomlings expansion introduces 40 new cards and a brand new "class" system. Collect 2 or more traits from the same class (Shells, Fish, or Corals) in your trait pile. Each trait then earns you the number of bonus points associated with its class type: Regular Shells, Fish, and Corals are each worth +1 Curious Shells, Fish, and Corals are each worth +2 Exotic Shells, Fish, and Corals are each worth +3 Visit the beaches of Castle Glass and build a collection of Shells, Fish, and Coral Doomlings to stock up your trait pile! -description from the publisher