This is a very quick game to play with others, or as a solitaire game.
Every player gets dealt three face down cards. No one will see these cards until the end.
Two cards then get dealt to each player face up so everyone can see them. You have one chance to change one or both of the cards. You could even leave the two cards as they are and use them.
Once everyone is done changing cards, all cards get turned up. The best hand wins.