In By the Seashore, you are a beachcomber searching the shoreline for beautiful things like sea glass, shark teeth, and sand dollars to add to your collection.
Play starts with six face-up cards in the middle of the table. On your turn, you can either trade up by discarding a card and taking one card of higher value or trade down by discarding a card and taking two cards of equal or lower value. Once you collect either a three-of-a-kind or a three-in-a-row, you can score that set; add one card to your tableau, pass one card, and dedicate the last for scoring. (You'll only score for symbols that you have dedicated in this way.) Different symbols shown on the cards have different scoring mechanisms, so cleverly arrange the cards in your tableau to maximize your points.
Play continues until everyone has at least five cards in their tableau, then you score. Whoever has the most points win!
—description from the publisher