### How to play

• Before starting the game, choose the number of opponents you will play against (1, 2, or 3 players);
• The game begins with the distribution of cards, and immediately after distribution, a card is turned face up on the table;
• On each player's turn, they can play a card that matches either the color or number of the card on the table;
• In addition to the regular cards, special cards are included. These cards have specific rules and make the game very enjoyable;
• Each special card has a functionality and a value (used when calculating the score);
• The player who is left with only one card must press the "1" button after playing it to alert the other players. Failure to do so results in that player having to draw two cards;
• The round is won by the player who runs out of cards first. This player receives a score equal to the sum of the values of the cards held by the opponents;
• The game ends when a player reaches 250 points.

### Special Cards

• Draw 2: Makes the next player draw two cards and lose their turn. Value: 20 points;
• Skip: Skips the next player's turn. Value: 20 points;
• Reverse: Reverses the direction of the game. Value: 20 points;
• Change Color: Allows you to change the current color to another. It can be played on top of any card. Value: 50 points;
• Draw 4: Forces the next player to draw four cards and allows a new color to be chosen. This card can only be played if the player has no other card to play. Value: 50 points.

### Strategies for Winning at 4 Colors

Effective strategies in 4 Colors can make the difference between winning and losing. One of the key tactics is to save special cards like "Skip," "Reverse," and "Draw 2" for critical moments in the game. This can prevent an opponent who is about to win from playing their last card. Additionally, it's smart to use cards of colors you know your opponent doesn't have, especially if they are down to just one card in hand.

Another strategy is to observe and memorize the colors and types of cards your opponents play. This can provide valuable clues about the cards they have in hand, allowing you to play more strategically. For example, if a player is avoiding playing red cards, they likely don't have many cards of that color. So, changing the color to red can be a clever move. These strategies, combined with a good dose of luck, can significantly increase your chances of winning in 4 Colors.

### Cognitive Benefits of Playing 4 Colors

Playing 4 Colors offers several benefits, especially in mental development. The game enhances skills such as logical reasoning, strategy, and quick decision-making. Moreover, it is a useful tool for cognitive development in children as it involves color and number recognition.

Another benefit of playing 4 Colors is stress relief. The game serves as a form of escapism, allowing players to disconnect from the daily worries and focus on a playful activity. This can be particularly helpful in improving emotional well-being and reducing anxiety levels.

### The Origin and History of the Uno Card Game

The Uno card game was created in 1971 by Merle Robbins, a barber from Ohio, United States. Robbins invented the game to settle a dispute over the rules of a similar card game called Crazy Eights between him and his family. After developing the rules and card design, he invested \$8,000 to produce the first batch of the game and began selling it in his own barbershop and local stores.

The local success of Uno caught the attention of Robert Tezak, an entrepreneur from Illinois, who bought the rights to the game in 1972. Tezak formed International Games, Inc. and mass-produced and distributed Uno. The game quickly gained popularity and became a global phenomenon. In 1992, Mattel acquired the rights to Uno and continues to be the leading manufacturer and distributor of the game to this day. Uno is now sold in over 80 countries and is considered one of the best-selling card games in the world.