How to Play Set

What is Set?

Set is a fast, pattern-spotting card game invented by Marsha Falco in 1974. It is played with a special deck of 81 cards, and the goal is simple to state but surprisingly addictive: find groups of three cards that form a valid Set. There are no turns to wait for. Everyone races to spot Sets at the same time, so the player with the sharpest eye collects the most cards.

The whole game rests on a single elegant rule, which we will build up carefully below. Once that rule clicks, you can play Set for a lifetime on the same small deck, because no two games ever feel quite the same.

The deck and the four features

Every card in the deck shows a symbol pattern described by exactly four features. Each feature can take one of three values, and the deck contains every possible combination exactly once. That is why the deck has 81 cards: 3 x 3 x 3 x 3 = 81. The four features are:

Number: a card shows 1, 2, or 3 symbols.
Color: the symbols are red, green, or purple.
Shape: the symbols are ovals, squiggles, or diamonds.
Shading: the symbols are solid (filled), striped (shaded), or open (just an outline).

So a single card might be, for example, two striped red ovals, or one solid purple diamond, or three open green squiggles. Every card is a unique mix of these four features.

The one rule: all same, or all different

Three cards form a valid Set when, for each of the four features, the three values are either all the same or all different. You check this feature by feature:

Numbers: all three cards show the same count, or all three show different counts.
Colors: all the same color, or all three colors.
Shapes: all the same shape, or all three shapes.
Shadings: all the same shading, or all three shadings.

The catch is that a single bad feature spoils everything. If even one feature has exactly two cards matching and one card different, the trio is not a Set, no matter how good the other three features look. Two-and-one is the forbidden pattern to watch for.

A useful fact: any two cards you pick have exactly one unique third card that completes them into a Set. That third card is always somewhere in the deck, whether or not it happens to be on the table.

Worked examples

Example 1 (a valid Set, all different). Consider one solid red oval, two solid red ovals, and three solid red ovals. Check each feature: number is 1, 2, 3 (all different, good); color is red, red, red (all same, good); shape is oval, oval, oval (all same, good); shading is solid, solid, solid (all same, good). Every feature passes, so these three cards form a Set.

Example 2 (a valid Set with a mix). Consider two striped red ovals, two solid green squiggles, and two open purple diamonds. Number is 2, 2, 2 (all same). Color is red, green, purple (all different). Shape is oval, squiggle, diamond (all different). Shading is striped, solid, open (all different). Some features are all the same and others are all different, and that is perfectly fine, so this is a valid Set.

Example 3 (NOT a Set). Consider one solid red oval, two solid red ovals, and two solid red ovals. Color, shape, and shading are all the same, which looks promising. But the numbers are 1, 2, 2: two cards match and one differs. That single two-and-one feature breaks the rule, so these three cards do not form a Set.

How the online game works

On Set with Friends, the computer handles all the bookkeeping so you can focus on spotting Sets. To start, 12 cards are dealt face up. When you see a Set, you simply click or tap its three cards. If the trio is valid, you earn a point, the three cards are removed, and three fresh cards are dealt to bring the board back up to 12.

Occasionally the 12 visible cards contain no Set at all. When that happens, the game automatically deals 3 extra cards for a total of 15, and play continues. In the rare case that 15 cards still hold no Set, more cards are added in groups of 3 until a Set appears.

The game is a race rather than a turn-based contest. Because everyone sees the same board in real time, scoring rewards speed and accuracy: the faster you recognize valid Sets, the more you collect. The game ends when the deck is exhausted and no Sets remain, and your final score is just the number of Sets you found.

You can play entirely on your own to practice and build pattern recognition, or share a room link to play with friends and family. The site is free, browser-based, and fully real-time, so everyone in a room sees each Set the instant it is claimed.

Game modes

Beyond classic Set, the site offers several modes to keep things fresh:

Normal: classic Set exactly as described above. Find three cards that are all-same-or-all-different on every feature.
Set Junior: a gentler beginner variant that uses a reduced deck. It is a great way for kids and brand-new players to learn the all-same-or-all-different idea with fewer cards in play.
UltraSet: instead of one Set, you look for four cards that split into two pairs which complete to the same third card. It is a deeper twist on the core rule for experienced players.
Set Chain: plays like Normal, except every new Set must reuse exactly one card from the Set you found just before, chaining your finds together.

Common beginner mistakes

Forgetting a feature. It is easy to verify color, shape, and number, then forget to check shading. Always run through all four features before claiming.
Accepting two-and-one. The most common error is treating a feature that is two-the-same-and-one-different as acceptable. It never is. That pattern always disqualifies the trio.
Assuming variety is required. A Set does not have to look colorful or varied. Three identical-looking attributes (for example, all the same color) are completely valid, as long as each feature is all-same or all-different.
Tunnel vision on one card. If you stare at a single card hunting for partners, you can miss Sets elsewhere. Scanning pairs and asking what third card would complete them is often faster.

The only way to get faster is to play. After a handful of games, the all-same-or-all-different check becomes almost automatic, and you will start seeing Sets jump off the board.

Keep learning

Ready for more? Pick up faster-recognition techniques on our strategy guide, or explore the different ways to play on the game variants page.

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