UNO FLIP is a variation of the classic UNO card game where each card has two sides: a "Light" side and a "Dark" side. The game starts on the Light side, and a special "FLIP" card is used to switch the game to the Dark side, which has different colors and action cards, with harsher penalties like "Draw Five" and "Skip Everyone". The objective is to be the first to play all your cards, with players being able to "Uno" and draw penalty cards if they fail to do so.