UNO Rules

UNO is a shedding game for two to ten players where the entire hand-management skill boils down to one repeated decision: match the card on top of the discard pile by color or number, or play an action card that changes the game state instead. It uses a purpose-built 108-card deck rather than a standard deck — four color suits (red, yellow, green, blue) numbered 0 through 9, plus Skip, Reverse, and Draw Two cards in each color, and a smaller set of colorless Wild and Wild Draw Four cards that work across every color.

Setup

Each player is dealt 7 cards. The rest of the deck becomes the draw pile, and the top card is flipped to start the discard pile — if that first card is an action card, its effect applies immediately as though the first player had played it (a Draw Two dealt as the starting card, for example, forces the first player to draw two before their turn even happens).

Playing a Turn

On your turn, play a card from your hand that matches the top discard card by color, by number, or by symbol (Skip matches Skip, Reverse matches Reverse, and so on regardless of color). Wild cards can be played on anything, at any time, and let the player choose the next color. If you have nothing playable, you must draw one card from the draw pile; if that drawn card is playable, most official rulesets let you play it immediately, though some tables require you to hold it until your next turn instead — worth agreeing on before the game starts, since it noticeably changes how often a turn gets skipped for nothing.

Action Cards, One at a Time

• Skip: the next player in turn order loses their turn entirely.
• Reverse: the direction of play flips (clockwise to counterclockwise or back). In a two-player game, Reverse functions exactly like a Skip, since reversing direction with only two players just returns the turn to whoever played it.
• Draw Two: the next player draws two cards and their turn is skipped.
• Wild: the player names the next color; any color at all, including the one just played.
• Wild Draw Four: names the next color AND forces the next player to draw four cards and lose their turn — but only if the player using it has no card of the currently active color in hand. A player who suspects a Wild Draw Four was played illegally (i.e., the player did have a matching color and used the card anyway) can challenge it; if the challenge is correct, the original player draws the four cards instead, but if the challenge is wrong, the challenger draws four in addition to their normal turn's draw.

Calling "UNO"

The moment you play your second-to-last card — leaving exactly one card in hand — you must say "UNO" out loud. Any other player who catches you not having said it before your turn passes can call you out, and you draw two penalty cards. This rule is where most casual UNO arguments actually happen, and it's genuinely part of the official ruleset, not a house addition — timing is everything, since the call only counts if it happens before the next player begins their turn.

Winning and Scoring

The round ends the instant a player plays their last card. In casual play, that's often the whole game — first to empty their hand wins outright. The official scored version instead tallies every other player's remaining hand (number cards at face value, Skip/Reverse/Draw Two worth 20 each, Wild and Wild Draw Four worth 50 each) and awards the round's winner that combined total; play continues across multiple rounds until one player reaches 500 points.

Stacking: The Most Common House Rule of All

The single most widely played UNO house rule — playing a Draw Two on top of another Draw Two (or a Wild Draw Four on another Wild Draw Four) to pass the combined draw penalty down the line instead of drawing yourself — has no basis in UNO's official rulebook. It's popular enough that many players assume it's official, and Mattel has occasionally acknowledged its popularity in marketing without ever adding it to the printed rules. Stacking meaningfully changes the game's pace and risk profile (a table playing with stacking can chain a four-player draw penalty into 8, 12, or more cards for the unlucky player who can't continue the chain), so it's worth explicitly agreeing on before dealing, not assuming.

What's Actually in the Deck

The 108 cards break down the same way in every standard edition: each of the four colors gets one 0, two each of 1 through 9 (18 number cards), two Skip, two Reverse, and two Draw Two — 25 cards per color, 100 total — plus 4 colorless Wild cards and 4 colorless Wild Draw Four cards to round out the deck. Knowing this breakdown matters for one practical reason: because every number 1–9 and every action card exists in duplicate, it's mathematically common for two players to hold matching cards simultaneously, which is part of why "jump-in" house play (below) feels natural to so many tables even though it isn't in the official rulebook — the deck's own duplication makes it possible far more often than a single-copy deck like a standard 52-card pack would.

Playing With a Large Group

UNO scales unusually well for a shedding game — it's playable up to ten players with no rule changes at all, which is rare among card games built around a single fixed deck. The tradeoff is pace: with more players, the draw pile empties and gets reshuffled from the discard pile far more often, and Skip and Draw Two cards affect a larger share of the table each time they land, so a run of bad luck near the end of the deck can compound quickly. Large groups also make the "jump-in" house variant (playing an identical card out of turn) feel less disruptive than in a four-player game, since with more players at the table, turn order naturally takes longer to come back around anyway.

Where UNO Came From

UNO was invented in 1971 by Merle Robbins, a barber in Reading, Ohio, after a disagreement with his son about the rules of Crazy Eights — a much older shedding game UNO is directly descended from, right down to the core "match by suit or rank" mechanic. Robbins and his family mortgaged their home to print the first 5,000 decks, selling them out of his barbershop and from campground clubhouses on family road trips before selling the rights in 1972 for $50,000 plus a royalty per game sold. The redesigned, mass-marketed version that most people know today came from International Games under Bob Tezak in the 1980s; Mattel acquired the brand in 1992 and has owned it since.

Variants and Regional House Rules

Beyond stacking, common table variants include the "7-0 rule" (playing a 7 lets you swap hands with any other player; playing a 0 rotates everyone's entire hand one position in the direction of play), "jump-in" (playing a card identical in both color and number to the top discard out of turn, skipping straight to your play regardless of whose turn it actually is), and forcing a player who forgets to say UNO to draw four instead of two at some tables. None of these are official — all of them are popular enough that a table assuming everyone already knows them is a common source of mid-game confusion.

The Arguments This Game Actually Produces

Beyond stacking and the UNO call timing, disputes center on whether a Wild Draw Four challenge can be made after the next player has already drawn their four cards (no — the challenge has to happen before the cards are drawn), and whether the very last card played to win a round can legally be a Wild Draw Four (yes, since there's no next player left to challenge it in a way that matters to the round's outcome). Both get a full answer on the full dispute breakdown; the scoring deep-dive lists the full point-value table by card type, and a printable score sheet for tables playing the full 500-point scored version across multiple rounds.

Questions People Still Ask Mid-Game

Can you play a Wild card even if you have a card that matches the color or number on the pile? Yes — Wild cards can always be played, at any time, whether or not you could have matched normally.

What happens if the draw pile runs out mid-game? The discard pile, everything except its top card, is reshuffled to form a new draw pile, and play continues without interruption.

If you draw a card and it's not playable, can you draw again voluntarily to look for something better? No — one draw per turn when you have nothing playable, then your turn ends regardless of what you drew, unless the table has specifically agreed to a "draw until you can play" house rule before the game started.

Can a Reverse card be played in response to a Skip, or does it have to match color or number first? A Reverse can only be played if it matches the top discard by color or by the Reverse symbol itself — action cards don't override the normal color-or-number matching requirement just because they're both action cards.