Match Cards: Match the cards in your hand with the card on the pile by either color or number. Keep playing until your hand is empty.
Special Cards: Utilize Action Cards (Skip, Reverse, Draw 2) and Wild Cards (Wild, Wild Draw 4) to hinder opponents or change the current color.
Call "UNO": Press "1" when you have only one card left. Failing to do so results in a two-card penalty.
Challenges: Challenge opponents if you suspect they have a playable color when playing a Wild Draw 4 card, or challenge them for not calling "UNO."
Stacking and Advanced Rules: Stack +2 and +4 cards, with specific stacking rules. Experience advanced rules like 7-0 hand swapping and Force Play.

Play Card: Use your finger or left mouse button.
Call "UNO": Press "1" when you have one card remaining.
Navigate Menu: Use your mouse or finger to navigate the main menu and select game modes.

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There are 108 cards in total, divided into four colors: Red, blue, green, and yellow, with 19 numbered cards and Action/Wild Cards.

Yes, in the multiplayer mode, you can play with up to 2, 3, or 4 friends.

Yes, it is completely free to play with no cost or charge.