In Uno Attack, special cards add excitement by introducing unique actions. The Reverse card changes the direction of play, while the Skip card makes the next player lose their turn. The Hit 2 card forces the next player to press the Launcher twice. Discard All lets a player discard all cards of the same color. The Trade Hands card allows players to swap hands. Wild cards let players choose a new color, and variations like Wild Hit-Fire, Wild All Hit, and Wild Attack-Attack involve pressing the Launcher, sometimes multiple times, depending on the card.