It essentially plays like regular UNO but with the addition of Flip cards. This UNO card deck is double-sided with a "light" side and a "dark" side. You start off playing with the light side, but if someone plays a Flip card, you have to switch to playing the dark side. And on the dark side, there are different action cards with stiffer penalties. Instead of a Draw One card, the dark side has a Draw Five card. Instead of a Skip Card, the dark side has a Skip Everyone card. You have to continue playing with the dark side until another Flip card is played.
