Match cards by colour or number, or play wild cards to change the colour. Drag cards onto the Discard Pile (the pile in the center right) to play cards. If you don't have playable cards, you can draw cards from the Draw Pile (the pile in the center left). Click the "Say UNO" button when you have one card left!
Note: There is a bug making it so that dragging over another card with your mouse pointer while hold clicking will make a card absorb the other. Thus, I strongly advise you to space your cards out. This is a fan creation that my mum requested I do. I am not affiliated with Mattel nor am I impersonating Mattel. Thank you for your understanding. Next game to do: UNO All Wild!