UNO, also known as Uno, Joonas Regalis, or Mac is one of the most famous card games internationally. It originated in Japan and was first published in China in 1941. Uno is an American-style card game that is played by using a specially printed, pre-printed deck. The rules of the game put it in the strange-shaped family of solitaire, and it shares many similarities to the classic European game mau-mono. It combines luck with skill, since you have to match cards in sets called "itsu" (which means "correct", in Italian).
Each player gets 5 action cards and a pile of 100 wild cards. When a player plays a wild card, that player skips the corresponding card from his turn and takes his place on the opposite end of the uno deck. At the beginning of each game session, the players are dealt a hand consisting of one hundred and twenty-one cards face down, in front of them are placed wild cards in a random manner. After dealing the cards, each player then immediately makes an action without taking his turn.
During the initial part of the game, where each player has a chance to draw one card before others, each player gets to choose a single wild card from among the two cards he drew. In this part of the game, the player may either choose to reverse the order of the cards (called "run") or he may choose to not reverse the order. If the player chooses not to reverse the order, that player will take a single card from the top of the on deck and place it face up. The person who has drawn a card must either discard it or pass it to the other players; if that player wishes to discard a card, then the discarded card has to be placed face up. These are the four main rules of UNO, which it is up to you to learn and master.