Mattel's UNO Wild Cards let you change the color of play, acting as any color you choose, even on top of a matching color, while the UNO All Wild! version makes every card a wild, removing color/number matching for fast, chaotic gameplay with added action cards like Wild Draw 4, Wild Reverse, and Wild Swap Hands. Standard Wild Cards let you declare a new color, while special ones add effects, making them powerful tools for controlling the game's flow.
