UNO 4 Colors is an online card game similar to the classic game UNO. Similar to the UNO gameplay, the goal of the game is to play the cards in your hand as quickly as possible in order to win.

In this game, each player's card hand contains four colors of cards, each with a 0-9 number card and several special cards (such as skip, flip direction, add 2, change color, and add 4) available. When players reach their turn, they need to play a card with a color or number that matches the card played by the previous player. If they cannot play, they must draw a card from the pile. If the card touched can be played, it can be played in this turn.

The appearance of special cards in the game makes it more interesting and challenging. When players use color change or add 4 cards, they can specify the color they want. When flipping or skipping cards appear, these special cards can also make the game more exciting.