Lost Cities is a card game in the Kosmos two-player series. The game originally consisted of a single deck of cards of rank 2–10 in five different colors with three special "handshakes" ("HS" in scoring examples below) in each suit, but as of 2019 the game now includes six colored suits, with the sixth color being optional for gameplay. A game board is included to organize discarded cards and help players organize their card collections.