In the game Reef, players are coral reef, carefully selecting colors and patterns in which to grow and expand. On each turn, players can decide to pick up a new card from a choice of four, or play a card that is already in hand. Each card gives two reef pieces and a pattern that scores points if the existing reef has it (after placing the two new pieces). The player with the most points when the reef pieces (or card deck) run out wins!

Reef is an abstract strategy game for players aged 8+. While it could take thousands of years for a coral reef to grow, a game of Reef takes 30-45 minutes.