The rules are simple. You click (or tap), on the deck to place a card. If the card says "Taco" and the words next to the hand is taco, then you put your pointer on the taco card, cat & cat, goat & goat, and so on.
Credit to Dolphin Hat Games for the original Taco Cat Goat Cheese Pizza card game. (You should play the card game, it's pretty fun.) Sadly, there is no narwhal, gorilla, or groundhog. You can remix this and add them if you want!